Proto Oncogene Tyrosine Protein Kinase Src (also known as c-Src) is a non-receptor tyrosine kinase that is involved in a variety of cellular processes, including cell growth, differentiation, motility, survival, and adhesion. It is a proto-oncogene, meaning that it has the potential to cause cancer when mutated or expressed at high levels. c-Src is a key regulator of signal transduction pathways and is involved in the regulation of cell proliferation, differentiation, and migration.