c-Jun is the name of a gene and protein which, in combination with
c-Fos, forms the
AP-1 early response
transcription factor. It is activated through double phosphorylation by the
JNK pathway but has also a phosphorylation-independent function. c-Jun knockout is lethal, but transgenic animals with a mutated c-Jun that cannot be phosphorylated (termed c-JunAA) can survive.
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