sentence: Therefore , it appears that , similar to expanding root cells , various types of cyclins are mostly localized to the nucleus of expanding endosperm cells.In contrast to CYCB1 ;3 and CYCD2 ; 1 , CYCD5 was found in association with ring-like structures localized exclusively in the cytoplasm of aleurone and subaleurone cell layers at both the mitotic ( Fig. 3e ) and endoreduplication ( Fig. 3f ) stages of endosperm development .