Cip1-interacting zinc finger protein may regulate the subcellular localization of p21(CIP/WAF1) [, ]. p21(CIP/WAF1) has a critical role in the negative control of cell growth. The Drosophila melanogasterprotein zinc finger protein on ecdysone puffs, which may have a role in the activation of early and late genes [], is also included in this entry.