sentence: CYCD2 ; 1 , CYCD5 ; 1 and the closely related ( 75 % identical at the amino acid level ) CYCD5 ; 2 were previously characterized with respect to their expression and CDK-associated activity during seed germination ( Guti é rrez et al. 2005 ; Quiroz-Figueroa and V á zquez-Ramos 2006 ; Lara-N ú ñ ez et al. 2008 ) .