TABLE 1.

Motif sequences in HIV and SIV strains^a

Unique Vif sequence	% that contain each motif variant
	HIV-1 (2,683)	HIV-2 (27)	SIVcpz (113)	SIVmac (32)	SIVagm (9)
W K S L V K	43.6	0.0	0.9	0.0	0.0
W N S L V K	47.4	0.0	20.4	0.0	0.0
W H S L V K	4.3	74.1	6.2	0.0	0.0
W H S L I K	0.0	22.2	40.7	90.6	11.1
W x S L V K	1.0	0.0	2.7	0.0	11.1
W Q G I V K	0.0	0.0	0.9	0.0	11.1
W x G I V K	0.0	0.0	0.9	0.0	11.1
W x G I V R	0.0	0.0	0.9	0.0	11.1
W x G I V x	0.0	0.0	0.9	0.0	11.1
Total	96.3	96.3	74.5	90.6	66.7

^aVif sequences from the indicated virus strains were identified in GenBank and analyzed for the presence of the motifs as shown.