Human matrix metallopeptidase-9 (MMP9), also known as gelatinase B, MANDP2, CLG4B, Macrophage gelatinase, GELB and EC 3.4.24, with Gln to Arg mutation on a.a. 279, GenBank Accession No. NM_004994), a.a. 20-707 (end) with C-terminal His-tag, MW=77.8 kDa, expressed in an HEK293 cell expression system.