A hyperthyroxinemia that is characterized by an increased affinity for thyroxine (T4) by transthyretin in clinically euthyroid individuals and that has_material_basis_in heterozygous mutation in the TTR gene on chromosome 18q12. (DO)
Note: Use of the qualifier "multiple interactions" designates that the annotated interaction
is comprised of a complex set of reactions and/or regulatory events, possibly involving
additional chemicals and/or gene products.