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Summary This antibody is specific for the approximately 95 kDa IR and shows no cross-reactivity with insulin like growth factor (IGF) receptors. Phosphorylation of the threonine residue within this sequence (corresponding to threonine 1348) decreases the affinity of this antibody for IR by approximately 100 fold. This antibody reacts with autophosphorylated IR, unoccupied IR, and the insulin IR complex. It has no effect on insulin-stimulated autophosphorylation.