FOS Family Protein

**Semantic type:** Amino Acid, Peptide, or Protein

**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)

**Synonyms:** - FOS Protein