sentence: These expression patterns are consistent with a positive role of A-type CDKs in both the mitotic and endoreduplication cell cycles ( Hemerly et al. 1995 ; Leiva-Neto et al. 2004 ) , and with positive and negative roles of B1-type CDKs in the mitotic and endoreduplication cell cycles , respectively ( Porceddu et al. 2001 ; Boudolf et al. 2004 , 2009 ) .