A heterodimeric DNA polymerase complex that catalyzes error-prone DNA synthesis in contexts such as translesion synthesis and double-stranded break repair. First characterized in Saccharomyces, in which the subunits are Rev3p and Rev7p; a third protein, Rev1p, is often associated with the polymerase dimer. [ http://www.ncbi.nlm.nih.gov/pubmed/16631579 http://www.ncbi.nlm.nih.gov/pubmed/16971464 ]