Retrovirology

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	Pro^ab	Pol^b	Absent

^aNon-primate lentiviral ERVs encode dUTPase within pol.
^bSome lineages may have lost dUTPase [9].

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ISSN: 1742-4690

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