Homologues of PCNA have also been identified in the archaea (Euryarchaeota and Crenarchaeota) and in Paramecium bursaria Chlorella virus 1 (PBCV-1) and in nuclear polyhedrosis viruses.
Identificáronse homólogos do PCNA nas arqueas (Euryarchaeota e Crenarchaeota) e no virus PBCV-1 (Paramecium bursaria Chlorella virus 1) e en virus da poliedrose nuclear.