Binds and inhibits CYCD2-1/CDKA-1 complex kinase activity. May target specifically CDKA-1. Specifically interacts with CDKA-1, but not with CDKB1-1. Interacts with CYCD4-1. Binds to FBL17. Distributed in a ponctuate pattern. Expressed in leaves and flowers and at lower levels in roots. May be due to competing acceptor splice site. Belongs to the CDI family. ICK/KRP subfamily.