Source:http://linkedlifedata.com/resource/umls/id/C2936429
MSH: A phosphatidylinositol 3-kinase subclass that includes enzymes formed through the heterodimerization of a p110 catalytic and a p85, p55, or p50 regulatory subunit. This subclass of enzymes is a downstream target of TYROSINE KINASE RECEPTORS and G PROTEIN-COUPLED RECEPTORS.