title: Human leukocyte proliferation in vitro to purified staphylococcal protein A.
mesh_terms: D001426:Bacterial Proteins; D002478:Cells, Cultured; D006801:Humans; D007962:Leukocytes / Q000276:immunology*; D013210:Staphylococcus / Q000276:immunology*
chemical_list: D001426:Bacterial Proteins