Human matrix metallopeptidase-3 (MMP3), also known as Stromelysin-1 (STMY1), GenBank Accession No. NM_002422, a.a. 18-477(end) with a Lys to Glu mutation at a.a. 45 and a C-terminal His-tag, expressed in a HEK293 cell expression system. MW=54 kDa.