high frequency mating does not occur in the interval of the cell cycle extending from the step before the initiation of dna synthesis ( cdc 7 ) through dna synthesis ( cdc 2 , 8 , and 21 ) , medial nuclear division ( cdc 13 ) , and late nuclear division ( cdc 14 and 15 ) .
C1332727
cdc 7
C0598312
dna synthesis