Fig. 6From: Contribution of type W human endogenous retroviruses to the human genome: characterization of HERV-W proviral insertions and processed pseudogenesPBS types among all HERV-W sequences and diversity between subgroup 1 and subgroup 2. The PBS types are identified by the amino acid single letter of the corresponding cellular tRNA. W = tryptophan, R = arginine, F = phenylalanine, I = isoleucine, S = serine, P = proline. “Others” category encloses Leucine (L), Glutamic Acid (E) and Glycine (G), each found only in one sequence. Elements that lost the PBS sequence (–) or with PBS with ambiguous assignation (?) are also includedBack to article page