The function of Ensembl gene identifier ENSG00000129757 (CDKN1C, cyclin dependent kinase inhibitor 1C) is as follows. Potent tight-binding inhibitor of several G1 cyclin/CDK complexes (cyclin E-CDK2, cyclin D2-CDK4, and cyclin A-CDK2) and, to lesser extent, of the mitotic cyclin B-CDC2. Negative regulator of cell proliferation. May play a role in maintenance of the non-proliferative state throughout life.