metalloendopeptidase activity obsolete gelatinase B activity true molecular_function MMP 9 gelatinase MMP 9 type IV collagen metalloproteinase gelatinase B activity collagenase IV GO:0004229 92-kDa gelatinase activity 92-kDa type IV collagenase activity This term was made obsolete because it represents a gene product. OBSOLETE. Catalysis of the cleavage of gelatin types I and V and collagen types IV and V. MMP-9 collagenase type IV 95 kDa type IV collagenase/gelatinase activity macrophage gelatinase activity type V collagenase activity matrix metalloproteinase 9 activity