Table 2.

Differential distribution of accessory genes among non-primate lentivirus genomes.

Accessory Gene	Non-Primate Lentivirus
	VMV	CAEV	EIAV	FIV	BIV	JDV
rev	+	+	+	+ a	+	+
vif	+	+	-	+	+	+
tat	+ b	+ b	+	-	+	+
orfS	+	+	+	+ c	-	-
vpy/vpw	-	-	-	-	+	-
tmx	-	-	-	-	+	+
s2	-	-	+	-	-	-

^a The Rev protein of FIV bears a divergent non-consensus nuclear export signal; ^b Tat proteins from VMV and CAEV lack the transactivation function; ^c orfS gene of FIV is called orf2.