Table 1.

Frequency of restriction enzyme sites in HIV

Type	Group	Subtype	N	NotI	MluI	SbfI	FseI	AsiSI
HIV-1	M	A	86	0	0	7	0	0
		B	211	17	4	99	0	0
		C	425	8	3	95	0	0
		D	61	0	1	46	0	0
		A/E	92	0	1	49	0	0
		F	20	0	2	12	0	0
		G	130	0	3	10	0	0
		H	100	0	1	3	0	0
		J	73	0	0	1	0	0
		K	23	0	0	13	0	0
	N		29	0	0	2	0	0
	O		143	0	3	30	0	0
HIV-2			18	1	1	2	0	0

N = Number of sequences analyzed.