Human ERK3, also known as MAPK6, HsT17250, p97MAPK, and PRKM6, GenBank Accession No. NM_002748, a.a. 1-721(end), with N-terminal GST tag, expressed in a Baculovirus infected Sf9 cell expression system. This protein runs at a higher M.W. by SDS-PAGE. Calculated MW =109 kDa.