A heterodimeric ubiquitin conjugating enzyme complex that catalyzes assembly of K63-linked polyubiquitin chains. In Saccharomyces cerevisiae, the complex comprises Ubc13p and Mms2p; in human it comprises UBE2N and UBE2V1/UBE2V2; and in plants UBC35/UBC36 and UEV1A/UEV1B/UEV1C/UEV1D-4.
UBE2N/UBE2NL complex