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IPT domain of Plexins and Cell Surface Receptors (PCSR) and related proteins . This subgroup contains IPT domains of plexins, receptors, like the plasminogen-related growth factor receptors, the hepatocyte growth factor-scatter factors, and the macrophage-stimulating receptors and of fibrocystin. Plexins are involved in the regulation of cell proliferation and of cellular adhesion and repulsion receptors. In general, there are three copies of the IPT_PCSR domain present preceeded by SEMA (semaphorin) and PSI (plexin, semaphorin, integrin) domains.