Before revision: Homologues of PCNA have also been identified in the archaea ("Euryarchaeota" and Thermoproteota) and in Paramecium bursaria Chlorella virus 1 (PBCV-1) and in nuclear polyhedrosis viruses.
After revision: This 9-1-1 clamp mounts onto DNA in the opposite direction.10.1038/s41594-022-00742-6Homologues of PCNA have also been identified in the archaea ("Euryarchaeota" and Thermoproteota) and in Paramecium bursaria Chlorella virus 1 (PBCV-1) and in nuclear polyhedrosis viruses.