Proc Natl Acad Sci U S A. 1994 Jan 18;91(2):549-53 doi:10.1073/pnas.91.2.549

Patel PH & Preston BD.

Marked infidelity of human immunodeficiency virus type 1 reverse transcriptase at RNA and DNA template ends.

On DNA/DNA blunt ends, adds a single nucleotide (A > G >> C|T). On RNA/DNA blund ends, adds more nucleotides (A >> G > C|T). Addition is favoured by increased dNTP levels.