Cdc2 (p34), also known as cell division cycle 2, G1 to S and G2 to M; cyclin dependent kinase 1, p34 kinase, and CDK1, is serine/threonine kinase that is ubiquitously expressed in eukaryotes. Cdc2 is found as both a cytoplasmic and nuclear protein. cdc2 is a catalytic subunit of a protein kinase called the M-phase promoting factor that induces entry into mitosis universally in eukaryotes. The cdc2 protein is highly phosphorylated on threonine, serine, and tyrosine; tyrosine phosphorylation is subject to cell cycle regulation. Cdc2 has been shown to interact with numerous proteins including cyclin A1, cyclin A2, cyclin B1, cyclin B2, BRCA1, dynamin 2, Fyn, Lyn, and p53. The POH-1 antibody recognizes human, monkey and bovine cdc2 and is useful for Western blotting. The POH-1 antibody has also been reported to be useful for immunoprecipitation, immunohistochemistry (formalin-fixed, paraffin embedded), and immunofluorescence.