NCIt definition : Encoded by JUN Family Genes, nuclear leucine zipper JUN Family Proteins (JUN, JUNB,
and JUND) can homodimerize, or heterodimerize with nuclear leucine zipper FOS Family
Proteins, to form the specific promoter/enhancer DNA-binding AP-1 transcription factor
complex that regulates target gene transcription in cell proliferation, differentiation,
and transformation. (NCI);