title: Effects of He-Ne/I. R. laser irradiation on two lines of normal human fibroblasts in vitro.
mesh_terms: D000367:Age Factors; D000368:Aged; D002478:Cells, Cultured; D003094:Collagen / Q000096:biosynthesis*; D004307:Dose-Response Relationship, Radiation; D006801:Humans; D007834:Lasers; D008297:Male; D008875:Middle Aged
chemical_list: D003094:Collagen