TABLE 2.

Identification of some expressed MLV proviruses^a

cDNA group and provirus no.b	Provirus type	Frequency (no. of hits)
cDNAs from normal liver
1	Intact, in Ctse	2
22	Intact, in Galnt11	4
32	Intact	2
38	pro-pol deletedc	1
68	pro-pol and env deletedc	7
Not assignedd		6
cDNAs from macroH2A1 knockout liver
32	Intact	2
62	Intact	1
38	pro-pol deletedc	1
29	env deleted	2
39	env deleted	5
70	env deleted	4
68	pro-pol and env deletedc	1
Not assignedd		7

^aCloned MLV cDNAs from the pro-pol region were sequenced and compared to the public genomic database for C57BL/6 mice (build 37.1). See Table S3 in the supplemental material for primer sequences.

^bProviruses were numbered according to their occurrence in the public genomic database for C57BL/6 mice (see Table S2 in the supplemental material).

^cThese pro-pol deletions ended before the start of the pro-pol segment that we amplified for this analysis.

^dSequences were not assigned to a provirus when they matched multiple proviruses or had more than one mismatch to their best hit.