NCIt definition : The Fos gene family consists of 4 members: FOS, FOSB, FOSL1, and FOSL2. These genes
encode leucine zipper proteins that can dimerize with proteins of the JUN family,
thereby forming the transcription factor complex AP-1. As such, the FOS proteins have
been implicated as regulators of cell proliferation, differentiation, and transformation.
(LocusLink);