TABLE 2.

Nucleotide sequence similarity of beta retrovirus sequences

Group	% Similarity with virusa (PERV group):
	β2	β3	β4	MMTV (β)	SERV (β)	MLV (γ)	PERV (γ)	BAEV (γ)	GALV (γ)	HERV-K10 (β)
β1	88	58	57	61	63	43	41	46	45	58
β2		40	61	69	68	44	43	51	47	57
β3			51	54	60	45	42	48	41	65
β4				67	67	39	45	41	42	60

^aMLV, murine leukemia virus; BAEV, baboon endogenous virus; GALV, gibbon ape leukemia virus.