Enriched in AIB; SIB; germline precursor cell; and hypodermis based on tiling array and single-cell RNA-seq studies. Is affected by several genes including daf-16; daf-2; and skn-1 based on microarray; tiling array; RNA-seq; and proteomic studies. Is affected by nineteen chemicals including 1-methylnicotinamide; manganese chloride; and sodium arsenite based on RNA-seq; microarray; and proteomic studies. Human ortholog(s) of this gene implicated in several diseases, including Alzheimer's disease; artery disease (multiple); autoimmune disease (multiple); and carcinoma (multiple). Human MMP9 enables identical protein binding activity; metalloendopeptidase activity; and serine-type endopeptidase activity. Is predicted to encode a protein with the following domain: Hemopexin-like domain superfamily. Is an ortholog of human MMP2 (matrix metallopeptidase 2); MMP23B (matrix metallopeptidase 23B); and MMP9 (matrix metallopeptidase 9).