IRS1 and IRS2 are part of the insulin or {HEAD ~ insulin} like {TAIL ~ growth factor} signaling pathway 
like
IRS1 and IRS2 are part of the insulin or { HEAD ~ insulin } like { TAIL ~ growth factor } signaling pathway
OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH