arrest by TGFp and cell-cell contact.~ 27~'P'associates with cyclin E-Cdk2 complexes in vivo
and in vitro, prevents their activation, and inhibits previously activated complexes, and~
27~'P'overexpression obstructs cell entry into S phase.~ 27~'P'potently inhibits Rb
phosphorylation by cyclin E-Cdk2, cyclin A-Cdk2, and cyclin D2-Cdk4.~ 27~'p'is highly
conserved and broadly expressed in human tissues, and its mRNA levels are similar in …