Insulin receptor substrate (IRS) is an important ligand in the insulin response of human cells.
IRS-1, for example, is an IRS protein that contains a phosphotyrosine binding-domain (PTB-domain). In addition, the insulin receptor contains a NPXpY domain. The PTB-domain binds the NPXpY domain. Thus, the insulin receptor binds IRS.
Read more about Insulin Receptor Substrate: Genes
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