CPP-like (cystein-rich polycomb-like protein) proteins are members of a small transcription factor family whose typical feature is the existence of one or two similar Cys-rich domains termed the CXC domain. The members of this family are widely present in plants and animals but absent in yeast, and the CXC domains of CPP-like proteins show high conservation across species from amoebae though plants to mammals (Andersen et al. 2007; Riechmann et al. 2000). CPP-like genes play an important role in development of reproductive tissue and control of cell division in plants.

Yang Z, Gu S, Wang X, Li W, Tang Z, Xu C.
Molecular evolution of the CPP-like gene family in plants: insights from comparative genomics of Arabidopsis and rice.
J Mol Evol, 2008. 67(3): p. 266-77.
PMID: 18696028