sentence: Accordingly , overexpression of CDKB1 ; 1 , combined with that of its interacting partner CYCA2 ;3 , triggers cell divisions and suppresses endoreduplication ( Boudolf et al. 2009 ) , and B1-type CDKs can drive progression through cell division , but not endoreduplication , upon depletion of CDKA ; 1 ( Nowack et al. 2012 ) .