From: A comprehensive analysis of the naturally occurring polymorphisms in HIV-1 Vpr: Potential impact on CTL epitopes
Residue
Residues in NL4-3 Vpr
Variant residue(s) noted in viruses of different clades
Number of variants
51
G
E, K, R
3
52
D
A, G, I, N
4
53
T
A, L, N, P, S
5
54
W
G, R
2