Cardiofaciocutaneous Syndrome 3, also known as cfc3, is related to cardiofaciocutaneous syndrome 1 and noonan syndrome 1. An important gene associated with Cardiofaciocutaneous Syndrome 3 is MAP2K1 (Mitogen-Activated Protein Kinase Kinase 1). Affiliated tissues include heart and skin, and related phenotypes are hyperhidrosis and hypotonia