G0/G1 switch regulatory protein 3, G0S3, Protein fosB, GOSB, Oncogene FOSB, Activator protein 1,
FosB interacts with Jun proteins enhancing their DNA binding activity. 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.
