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Table 1 Typical characteristics of ERV classes

From: Evolution and gene capture in ancient endogenous retroviruses - insights from the crocodilian genomes

  ERV1 ERV2 ERV3 ERV4
TSD length 4 bp 6 bp 5 bp 5 bp
Zinc-finger motifs 1-2 2 Absent Absent
GPF/Y motif or equivalent Present Present Absent Absent
dUTPase Absent Proab Polb Absent
  1. aNon-primate lentiviral ERVs encode dUTPase within pol.
  2. bSome lineages may have lost dUTPase [9].