This term is obsolete.
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Definition:
OBSOLETE. The component of the endoplasmic reticulum membrane consisting of the gene products and protein complexes having at least some part of their peptide sequence embedded in the hydrophobic region of the membrane.
Comment:
This term was obsoleted because it represents protein topology, not a cellular component.
Synonyms:
exact_synonym:
ER integral membrane protein; integral to ER membrane