title: Effect of nonspecific factors on focus formation by Rous sarcoma virus. II. Polyanions, divalent cations, temperature, and tryptose phosphate broth.
mesh_terms: D000818:Animals; D001358:Avian Sarcoma Viruses / Q000254:growth & development*; D002118:Calcium / Q000494:pharmacology; D002460:Cell Line; D002471:Cell Transformation, Neoplastic / Q000187:drug effects*; D002642:Chick Embryo; D003470:Culture Media; D046508:Culture Techniques; D003911:Dextrans / Q000494:pharmacology; D005347:Fibroblasts; D006493:Heparin / Q000494:pharmacology; D008274:Magnesium / Q000494:pharmacology; D010710:Phosphates; D011134:Polysaccharides; D013431:Sulfates / Q000494:pharmacology; D013696:Temperature
chemical_list: D003470:Culture Media; D003911:Dextrans; D010710:Phosphates; D011134:Polysaccharides; D013431:Sulfates; D006493:Heparin; D008274:Magnesium; D002118:Calcium