Figure 4

Relative cloning frequencies of transcriptionally active HERV-W env loci in human PBMC. The relative cloning frequencies are given as the number of cDNA clones from a particular HERV-W env locus relative to the number of all cDNA clones analyzed. Frequencies were calculated separately for all non-recombined clones (n = 233 sequences; white bars), all recombined clones (n = 99 sequences, originating from 238 transcripts [see text and Table 2]; black bars), and for non-recombined and recombined clones together (n = 332; originating from 471 transcripts [see text and Table 2]; gray bars).