we determined the nucleotide sequence of about 1 kilobase of dna 3 ' to the 5 ' long terminal repeat of three noninfectious ad one infectious proviral dna clones of spleen necrosis virus , an avian retrovirus , to determine if the types of nucleic acid changes involved in retrovirus mutation shed light on special features of retrovirus replication .
C0012854
dna
C0598312
replication