P8 is a short 80-82 amino acid protein that is conserved from nematodes to humans. It carries at least one protein kinase C domain suggesting a possible role in signal transduction and it is thought to be a phosphoprotein, but the sites of phosphorylation and the kinases involved remain to be determined [1].

1: Cloning and expression of the human p8, a nuclear protein with mitogenic activity. Vasseur S, Vidal Mallo G, Fiedler F, Bodeker H, Canepa E, Moreno S, Iovanna JL; Eur J Biochem. 1999;259:670-675. PMID:10092851