Immunogen sequence: VRKIDAAISD KEKNKTYFFV EDKYWRFDEK RNSMEPGFPK QIAEDFPGID SKIDAVFEEF GFFYFFTGSS QLEFDPNAKK VTHTLKSNSW LNC. MMP3 (stromelysin-1) belongs to the peptidase M10A subfamily. It is secreted in its pro-protein form, and is activated by extracel