Proc Natl Acad Sci U S A. 1989 Nov;86(21):8343-7 doi:10.1073/pnas.86.21.8343

Perrino FW, Preston BD, Sandell LL, Loeb LA.

Extension of mismatched 3' termini of DNA is a major determinant of the infidelity of human immunodeficiency virus type 1 reverse transcriptase.

HIV-1 RT can extend A-mismatches with various efficiencies: A:C >> A:A > A:G.