sentence: Because CYCD2 ; 1 , on the contrary , was found in mitotic as well as endoreduplicated endosperm cells ( Fig. 3c , d ) , its corresponding complexes with A-type CDKs could function at stimulating both the mitotic and endoreduplication cell cycles.Altogether , CYCB1 ;3 localization and CYCB1 ;3 - associated kinase activity during development suggest that CYCB1 ;3 / CDK complexes function in both mitotic and endoreduplication cell cycles .