| 1310987 | Cyb561 | cytochrome b-561 | ENCODES a protein that exhibits transmembrane monodehydroascorbate reductase activity (ortholog); INVOLVED IN ascorbate homeostasis (ortholog); intracellular iron ion homeostasis (ortholog); ASSOCIATED WITH Orthostatic Hypotension 2 (ortholog); FOUND IN chromaffin granule membrane (ortholog); INTERA CTS WITH 2,2',4,4'-Tetrabromodiphenyl ether; 2,3,7,8-tetrachlorodibenzodioxine; 6-propyl-2-thiouracil | 10 | 91377866 | 91388548 | Rat | 111 | symbol , PhenoGen | gene, protein-coding, PROVISIONAL [RefSeq] |
| 1322199 | CYB561 | cytochrome b561 | Predicted to enable transmembrane monodehydroascorbate reductase activity. Predicted to be involved in ascorbate homeostasis. Predicted to be located in chromaffin granule membrane. Predicted to be active in lysosomal membrane. [provided by Alliance of Genome Resources, Jul 2025] | 17 | 63432304 | 63446639 | Human | 130 | symbol , old_gene_name , COSMIC , Human Proteome Map , old_gene_symbol | gene, protein-coding, VALIDATED [RefSeq] |
| 1322200 | Cyb561 | cytochrome b-561 | Enables transmembrane monodehydroascorbate reductase activity. Involved in ascorbate homeostasis and intracellular iron ion homeostasis. Located in chromaffin granule membrane. Is expressed in several structures, including genitourinary system; gut; nervous system; node; and nose. Orthologous to hum an CYB561 (cytochrome b561). [provided by Alliance of Genome Resources, Jul 2025] | 11 | 105824528 | 105844157 | Mouse | 153 | symbol , old_gene_name , PhenoGen , description | gene, protein-coding, VALIDATED [RefSeq] |
| 12371766 | CYB561 | cytochrome b561 | ENCODES a protein that exhibits transmembrane monodehydroascorbate reductase activity (ortholog); INVOLVED IN ascorbate homeostasis (ortholog); intracellular iron ion homeostasis (ortholog); ASSOCIATED WITH Orthostatic Hypotension 2 (ortholog); FOUND IN chromaffin granule membrane (inferred); cytopl asmic vesicle (inferred) | 9 | 11461738 | 11474413 | Dog | 13 | symbol | gene, protein-coding, MODEL [RefSeq] |
| 13916843 | CYB561 | cytochrome b561 | ENCODES a protein that exhibits transmembrane monodehydroascorbate reductase activity (ortholog); INVOLVED IN ascorbate homeostasis (ortholog); ASSOCIATED WITH Orthostatic Hypotension 2 (ortholog); FOUND IN chromaffin granule membrane (ortholog); INTERACTS WITH deoxynivalenol; resveratrol | | | | Pig | 19 | symbol , old_gene_name | gene, protein-coding, PROVISIONAL [RefSeq] |
| 18734032 | CYB561 | cytochrome b561 | ENCODES a protein that exhibits metal ion binding (inferred); oxidoreductase activity (inferred); transmembrane monodehydroascorbate reductase activity (inferred); INVOLVED IN ascorbate homeostasis (inferred); intracellular iron ion homeostasis (inferred); ASSOCIATED WITH Orthostatic Hypotension 2 ( ortholog); FOUND IN chromaffin granule membrane (inferred); cytoplasmic vesicle (inferred); lysosomal membrane (inferred) | | | | Green Monkey | 14 | symbol , old_gene_name | gene, protein-coding, MODEL [RefSeq] |
| 155249831 | cyb561 | | | | | | Tropical Clawed Frog | | symbol | gene, null |
| 155253826 | cyb561.L | | | | | | African Clawed Frog | | symbol | gene, null |
| 405859308 | cyb561.S | | | | | | African Clawed Frog | | symbol | gene, null |
| 405860035 | cyb561.S | | | | | | African Clawed Frog | | symbol | gene, null |
| 405862119 | cyb561.S | | | | | | African Clawed Frog | | symbol | gene, null |
| 405863076 | cyb561.S | | | | | | African Clawed Frog | | symbol | gene, null |
| 626469029 | cyb561.S | | | | | | African Clawed Frog | | symbol | gene, null |
| 11976754 | LOC100993774 | transmembrane ascorbate-dependent reductase CYB561 | ENCODES a protein that exhibits metal ion binding (inferred); oxidoreductase activity (inferred); transmembrane monodehydroascorbate reductase activity (inferred); INVOLVED IN ascorbate homeostasis (inferred); intracellular iron ion homeostasis (inferred); ASSOCIATED WITH Orthostatic Hypotension 2 ( ortholog); FOUND IN chromaffin granule membrane (inferred); cytoplasmic vesicle (inferred); lysosomal membrane (inferred) | 17 | 57513820 | 57528326 | Bonobo | 14 | ensembl_gene_symbol , name | gene, protein-coding, MODEL [RefSeq] |
| 1304670 | Cyb561a3 | cytochrome b561 family, member A3 | ENCODES a protein that exhibits transmembrane ascorbate ferrireductase activity (ortholog); INVOLVED IN intracellular iron ion homeostasis (ortholog); FOUND IN late endosome membrane (ortholog); lysosomal membrane (ortholog); lysosome (ortholog); INTERACTS WITH 2,4-dinitrotoluene; aflatoxin B1; alph a-Zearalanol | 1 | 216641108 | 216662495 | Rat | 85 | symbol , old_gene_name , PhenoGen | gene, protein-coding, VALIDATED [RefSeq] |
| 1350964 | CYB561A3 | cytochrome b561 family member A3 | Predicted to enable transmembrane ascorbate ferrireductase activity. Predicted to be involved in intracellular iron ion homeostasis. Located in nucleolus. [provided by Alliance of Genome Resources, Jul 2025] | 11 | 61348745 | 61362283 | Human | 83 | symbol , old_gene_name , COSMIC , Human Proteome Map | gene, protein-coding, VALIDATED [RefSeq] |
| 1615697 | Cyb561a3 | cytochrome b561 family, member A3 | Enables transmembrane ascorbate ferrireductase activity. Involved in intracellular iron ion homeostasis. Located in late endosome membrane and lysosomal membrane. Is expressed in ganglia; jaw bone; and neural retina. Orthologous to human CYB561A3 (cytochrome b56 1 family member A3). [provided by Alliance of Genome Resources, Jul 2025] | 19 | 10554521 | 10574196 | Mouse | 84 | symbol , old_gene_name , PhenoGen , description | gene, protein-coding, VALIDATED [RefSeq] |
| 12280480 | CYB561A3 | cytochrome b561 family member A3 | ENCODES a protein that exhibits metal ion binding (inferred); oxidoreductase activity (inferred); transmembrane ascorbate ferrireductase activity (inferred); INVOLVED IN intracellular iron ion homeostasis (inferred); transmembrane transport (inferred); FOUND IN late endosome membrane (inferred); lys osomal membrane (inferred); lysosome (inferred) | 18 | 55039788 | 55049739 | Dog | 16 | symbol | gene, protein-coding, MODEL [RefSeq] |
| 13967666 | CYB561A3 | cytochrome b561 family member A3 | ENCODES a protein that exhibits metal ion binding (inferred); oxidoreductase activity (inferred); transmembrane ascorbate ferrireductase activity (inferred); INVOLVED IN intracellular iron ion homeostasis (inferred); transmembrane transport (inferred); FOUND IN late endosome membrane (inferred); lys osomal membrane (inferred); lysosome (inferred) | | | | Pig | 16 | symbol | gene, protein-coding, MODEL [RefSeq] |
| 18443008 | CYB561A3 | cytochrome b561 family member A3 | ENCODES a protein that exhibits metal ion binding (inferred); oxidoreductase activity (inferred); transmembrane ascorbate ferrireductase activity (inferred); INVOLVED IN intracellular iron ion homeostasis (inferred); transmembrane transport (inferred); FOUND IN late endosome membrane (inferred); lys osomal membrane (inferred); lysosome (inferred) | | | | Green Monkey | 16 | symbol , old_gene_name | gene, protein-coding, MODEL [RefSeq] |
| 1310829 | Cyb561d1 | cytochrome b561 family, member D1 | ENCODES a protein that exhibits metal ion binding (inferred); transmembrane ascorbate ferrireductase activity (inferred); transmembrane monodehydroascorbate reductase activity (inferred); INVOLVED IN transmembrane transport (inferred); FOUND IN membrane (inferred); INTERACTS WITH 2,2',4,4'-Tetrabrom odiphenyl ether; 2,4-dinitrotoluene; 6-propyl-2-thiouracil | 2 | 198523031 | 198525671 | Rat | 59 | symbol , PhenoGen | gene, protein-coding, VALIDATED [RefSeq] |
| 1321956 | CYB561D1 | cytochrome b561 family member D1 | Predicted to enable metal ion binding activity; transmembrane ascorbate ferrireductase activity; and transmembrane monodehydroascorbate reductase activity. Predicted to be involved in transmembrane transport. Predicted to be located in membrane. [provided by Alliance of Genome Resources, Jul 2025] | 1 | 109494094 | 109500435 | Human | 62 | symbol , old_gene_name , COSMIC , Human Proteome Map | gene, protein-coding, VALIDATED [RefSeq] |
| 1619986 | Cyb561d1 | cytochrome b-561 domain containing 1 | Predicted to enable metal ion binding activity; transmembrane ascorbate ferrireductase activity; and transmembrane monodehydroascorbate reductase activity. Predicted to be involved in transmembrane transport. Predicted to be located in membrane. Orthologous to human CYB561 B561D1 (cytochrome b561 family member D1). [provided by Alliance of Genome Resources, Jul 2025] | 3 | 108103082 | 108109542 | Mouse | 63 | symbol , old_gene_name , PhenoGen , description | gene, protein-coding, VALIDATED [RefSeq] |
| 12101228 | CYB561D1 | cytochrome b561 family member D1 | ENCODES a protein that exhibits metal ion binding (inferred); transmembrane ascorbate ferrireductase activity (inferred); transmembrane monodehydroascorbate reductase activity (inferred); INVOLVED IN transmembrane transport (inferred); FOUND IN membrane (inferred) | 6 | 42363028 | 42365574 | Dog | 9 | symbol | gene, protein-coding, MODEL [RefSeq] |
| 14035727 | CYB561D1 | cytochrome b561 family member D1 | ENCODES a protein that exhibits metal ion binding (inferred); transmembrane ascorbate ferrireductase activity (inferred); transmembrane monodehydroascorbate reductase activity (inferred); INVOLVED IN transmembrane transport (inferred); FOUND IN membrane (inferred) | | | | Pig | 9 | symbol | gene, protein-coding, MODEL [RefSeq] |
| 18544453 | CYB561D1 | cytochrome b561 family member D1 | ENCODES a protein that exhibits metal ion binding (inferred); transmembrane ascorbate ferrireductase activity (inferred); transmembrane monodehydroascorbate reductase activity (inferred); INVOLVED IN transmembrane transport (inferred); FOUND IN membrane (inferred) | | | | Green Monkey | 7 | symbol , old_gene_name | gene, protein-coding, MODEL [RefSeq] |
| 598151031 | cyb561d1 | | | | | | Tropical Clawed Frog | | symbol | gene, null |
| 598151066 | cyb561d1 | | | | | | Tropical Clawed Frog | | symbol | gene, null |
| 598151697 | cyb561d1 | | | | | | Tropical Clawed Frog | | symbol | gene, null |
| 1353992 | CYB561D2 | cytochrome b561 family member D2 | | 3 | 50365363 | 50368197 | Human | | symbol , old_gene_name , COSMIC , Human Proteome Map | gene, ncrna, VALIDATED [RefSeq] |
| 1359644 | Cyb561d2 | cytochrome b561 family, member D2 | ENCODES a protein that exhibits heme binding (ortholog); transmembrane ascorbate ferrireductase activity (ortholog); transmembrane monodehydroascorbate reductase activity (ortholog); INVOLVED IN ascorbate homeostasis (ortholog); FOUND IN endoplasmic reticulum (ortholog); vesicle (ortholog); INTERACT S WITH 6-propyl-2-thiouracil; acrylamide; bisphenol A | 8 | 117091844 | 117094434 | Rat | 94 | symbol , old_gene_name , PhenoGen | gene, protein-coding, VALIDATED [RefSeq] |
| 1552368 | Cyb561d2 | cytochrome b-561 domain containing 2 | Enables heme binding activity and transmembrane ascorbate ferrireductase activity. Predicted to be involved in ascorbate homeostasis. Located in endoplasmic reticulum and vesicle. Is expressed in several structures, including Meckel's cartilage; female reproductive system; lower leg mesenchyme; skel eton; and thymus. Orthologous to human CYB561D2 (cytochrome b561 family member D2). [provided by Alliance of Genome Resources, Jul 2025] | 9 | 107416210 | 107419392 | Mouse | 90 | symbol , old_gene_name , PhenoGen , description | gene, protein-coding, VALIDATED [RefSeq] |
| 12160767 | CYB561D2 | cytochrome b561 family member D2 | ENCODES a protein that exhibits heme binding (inferred); metal ion binding (inferred); oxidoreductase activity (inferred); INVOLVED IN ascorbate homeostasis (inferred); transmembrane transport (inferred); FOUND IN cytoplasmic vesicle (inferred); cytoplasmic vesicle membrane (inferred); endoplasmic r eticulum (inferred) | 20 | 39002941 | 39007085 | Dog | 19 | symbol | gene, protein-coding, MODEL [RefSeq] |
| 18540456 | CYB561D2 | cytochrome b561 family member D2 | ENCODES a protein that exhibits heme binding (inferred); metal ion binding (inferred); oxidoreductase activity (inferred); INVOLVED IN ascorbate homeostasis (inferred); transmembrane transport (inferred); FOUND IN cytoplasmic vesicle (inferred); cytoplasmic vesicle membrane (inferred); endoplasmic r eticulum (inferred) | | | | Green Monkey | 16 | symbol , old_gene_name | gene, protein-coding, MODEL [RefSeq] |
| 155239688 | cyb561d2 | | | | | | Tropical Clawed Frog | | symbol | gene, null |
| 155782982 | CYB561D2 | cytochrome b561 family member D2 | Enables heme binding activity and transmembrane monodehydroascorbate reductase activity. Involved in ascorbate homeostasis. Predicted to be located in vesicle. Predicted to be active in endoplasmic reticulum. [provided by Alliance of Genome Resources, Jul 2025] | 3 | 50350862 | 50354069 | Human | 84 | symbol , old_gene_name , COSMIC , Human Proteome Map | gene, protein-coding, VALIDATED [RefSeq] |
| 626468260 | cyb561d1.S | | | | | | African Clawed Frog | | symbol | gene, null |
| 626469206 | cyb561d1.S | | | | | | African Clawed Frog | | symbol | gene, null |
| 155259088 | cyb561d2.L | | | | | | African Clawed Frog | | symbol | gene, null |
| 155253416 | cyb561d2.S | | | | | | African Clawed Frog | | symbol | gene, null |
| 1313951 | CYBRD1 | cytochrome b reductase 1 | This gene is a member of the cytochrome b(561) family that encodes an iron-regulated protein. It highly expressed in the duodenal brush border membrane. It has ferric reductase activity and is believed to play a physiological role in dietary iron absorption. [provided by RefSeq, Jul 2008] | 2 | 171522233 | 171558129 | Human | 144 | old_gene_symbol | gene, protein-coding, VALIDATED [RefSeq] |
| 18925399 | LOC101704367 | cytochrome b561 domain-containing protein 2 | ENCODES a protein that exhibits heme binding (inferred); metal ion binding (inferred); oxidoreductase activity (inferred); INVOLVED IN transmembrane transport (inferred); FOUND IN cytoplasmic vesicle (inferred); cytoplasmic vesicle membrane (inferred); endoplasmic reticulum (inferred) | | | | Naked Mole-Rat | 10 | old_gene_symbol | gene, protein-coding, MODEL [RefSeq] |
| 14054868 | LOC100517372 | cytochrome b561 domain-containing protein 2 | ENCODES a protein that exhibits heme binding (inferred); metal ion binding (inferred); oxidoreductase activity (inferred); INVOLVED IN ascorbate homeostasis (inferred); transmembrane transport (inferred); FOUND IN cytoplasmic vesicle (inferred); cytoplasmic vesicle membrane (inferred); endoplasmic r eticulum (inferred); INTERACTS WITH deoxynivalenol | | | | Pig | 20 | ensembl_gene_symbol | gene, protein-coding, MODEL [RefSeq] |
| 11939240 | LOC100970458 | probable transmembrane reductase CYB561D1 | ENCODES a protein that exhibits metal ion binding (inferred); transmembrane ascorbate ferrireductase activity (inferred); transmembrane monodehydroascorbate reductase activity (inferred); INVOLVED IN transmembrane transport (inferred); FOUND IN membrane (inferred) | 1 | 111870272 | 111877783 | Bonobo | 7 | ensembl_gene_symbol , name | gene, protein-coding, MODEL [RefSeq] |
| 11813109 | LOC100972845 | transmembrane reductase CYB561D2 | ENCODES a protein that exhibits heme binding (inferred); metal ion binding (inferred); oxidoreductase activity (inferred); INVOLVED IN ascorbate homeostasis (inferred); transmembrane transport (inferred); FOUND IN cytoplasmic vesicle (inferred); cytoplasmic vesicle membrane (inferred); endoplasmic r eticulum (inferred) | 3 | 50276985 | 50280196 | Bonobo | 16 | ensembl_gene_symbol , name | gene, protein-coding, MODEL [RefSeq] |
| 11993614 | LOC100974743 | lysosomal membrane ascorbate-dependent ferrireductase CYB561A3 | ENCODES a protein that exhibits metal ion binding (inferred); oxidoreductase activity (inferred); transmembrane ascorbate ferrireductase activity (inferred); INVOLVED IN intracellular iron ion homeostasis (inferred); transmembrane transport (inferred); FOUND IN endomembrane system (inferred); late e ndosome membrane (inferred); lysosomal membrane (inferred) | 11 | 56648322 | 56661758 | Bonobo | 17 | ensembl_gene_symbol , name | gene, protein-coding, MODEL [RefSeq] |
| 8737909 | LOC102004854 | cytochrome b561 domain-containing protein 2 | | NW_004955532 | 2140745 | 2155258 | Chinchilla | | ensembl_gene_symbol | gene, protein-coding, MODEL [RefSeq] |
| 8782229 | LOC102016503 | cytochrome b ascorbate-dependent protein 3 | ENCODES a protein that exhibits transmembrane ascorbate ferrireductase activity (ortholog); INVOLVED IN intracellular iron ion homeostasis (ortholog); FOUND IN late endosome membrane (ortholog); lysosomal membrane (ortholog); lysosome (ortholog) | NW_004955511 | 6191644 | 6200099 | Chinchilla | 7 | ensembl_gene_symbol | gene, protein-coding, MODEL [RefSeq] |
| 8993911 | LOC102030342 | cytochrome b561 domain-containing protein 1 | | NW_004955435 | 12913452 | 12918976 | Chinchilla | 2 | ensembl_gene_symbol | gene, protein-coding, MODEL [RefSeq] |
| 155782919 | LOC127898564 | CYB561D2-LOC101928965 | | 3 | 50350862 | 50368197 | Human | | name | gene, ncrna, VALIDATED [RefSeq] |
| 1604148 | FRRS1 | ferric chelate reductase 1 | Members of the cytochrome b561 (CYB561; MIM 600019) family, including FRRS1, reduce ferric to ferrous iron before its transport from the endosome to the cytoplasm (Vargas et al., 2003 [PubMed 14499595]).[supplied by OMIM, Mar 2008] | 1 | 99703970 | 99766635 | Human | 63 | description | gene, protein-coding, VALIDATED [RefSeq] |
| 11683406 | LOC100972759 | plasma membrane ascorbate-dependent reductase CYBRD1 | ENCODES a protein that exhibits identical protein binding (inferred); metal ion binding (inferred); oxidoreductase activity (inferred); INVOLVED IN response to iron ion (ortholog); PARTICIPATES IN iron uptake pathway; ASSOCIATED WITH COVID-19 (ortholog); FOUND IN apical plasma membrane (inferred); b rush border membrane (inferred); lysosomal membrane (inferred) | 2B | 58813554 | 58849162 | Bonobo | 25 | old_gene_name | gene, protein-coding, MODEL [RefSeq] |