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Yes is a member of the Src family of tyrosine kinases. The cellular gene was initially identified as a homologue of v-yes, the oncogene of avian sarcoma virus Y73. At least nine different Src family members have been identified. yes, fyn, and Src are widely expressed in a variety of cell types, while the remaining members are primarily expressed in hematopoietic cells. Members of this family have several common features: they have unique N-terminal domains, they attach to cellular membranes through a myristylated N-terminus and they have homologus SH2, SH3, and catalytic domains. The common expression patterns of Yes, fyn, and Src suggest some overlapping functions. All three of these kinases can physically associate with a number of cell-surface molecules which appear to increase their catalytic activity.
