FIG 3.

Comparison of FeLV-A and FeLV-B sequences from individual cats illustrates both de novo recombination and horizontal transmission. Neighbor-joining phylogeny on the left illustrates FeLV-A env recovered from a single individual. (Right) The tanglegram illustrates the relationship with FeLV-B env recovered from the same individual. Colored lines highlight env of two subtypes recovered from the same individual. This figure demonstrates that env variants from an individual are usually closely related; however, in half the cats with multiple variants detected, FeLV-B variants were distinct enough to group into separate clades.