title: Activity of a macrophage factor in collagen formation by silica.
mesh_terms: D000818:Animals; D003094:Collagen / Q000096:biosynthesis*; D004247:DNA / Q000032:analysis; D006909:Hydroxyproline / Q000032:analysis; D066298:In Vitro Techniques; D008264:Macrophages / Q000187:drug effects / Q000378:metabolism*; D010587:Phagocytosis; D051381:Rats; D012822:Silicon Dioxide / Q000494:pharmacology*; D014025:Titanium / Q000494:pharmacology
chemical_list: D012822:Silicon Dioxide; D003094:Collagen; D004247:DNA; D014025:Titanium; D006909:Hydroxyproline