Immunogen sequence: NEEEYEDVVE DVKEECQKYG PVVSLLVPKE NPGRGQVFVE YANAGDSKAA QKLLTGRMFD GKFVVATFYP LSAYKRGYLY QTLL. Upon serum stimulation, KIS, a member of the Ser/Thr protein kinase family, phosphorylates CDKN1B/p27Kip1, thus controlling CDKN1B subcellul