the comparative infectivity of harvey murine sarcoma virus ( ha-musv ) dna for nih 3t3 cells was determined for supercoiled ha-musv dna molecularly cloned in lambda phage and pbr322 at its unique ecori site ( which is located near the middle of the 6-kilobase pair [ kbp ] unintegrated linear viral dna ) and for two cloned subgenomic fragments : one was 3.8 kbp and lacked about 1 kbp from each side of the ecori site , and the second did not contain the 3 kbp of the unintegrated linear viral dna located on the 3 ' side of the ecori site .
C0012854
dna
C0012939
viral dna