Rabbit Anti-Human INSR (phospho Tyr1158) monoclonal antibody for FC, WB. Insulin receptor (IR), belongs to the growth factor receptor tyrosine kinase superfamily which regulates multiple signaling pathways. It is a heterotetrameric membrane glycoprotein consisting of alpha and beta subunits encoded by the INSR gene in humans. IR and IGF-1 receptors share major structural and functional similarity. The earliest cellular response to insulin stimulation is autophosphorylation of tyrosine in IR. In humans, the IR gene is located on chromosome 19.