pulse labeling of replicating viral dna in the presence of ara-ctp revealed two consistent differences in the pattern found in control pulses : ( i ) predominant labeling of short chains ( 5s ) with reduced amounts of radioactivity in the longer growing viral dna strands ( smaller than or equal to 16s ) , and ( ii ) a one-third to one-half reduction in size for short dna chains labeled in the presence of ara-ctp .
C0012939
viral dna
C0012854
dna