title: Introduction to the issues: new potential contaminants and other exogenous agents.
authors: CBER/FDA, Bethesda, MD 20892.
authors: P
authors: P
authors: Albrecht
mesh_terms: D000818:Animals; D001688:Biological Products / Q000302:isolation & purification / Q000592:standards*; D002460:Cell Line; D004340:Drug Contamination; D006801:Humans; D012449:Safety; D014481:United States; D014780:Viruses / Q000302:isolation & purification* / Q000472:pathogenicity
chemical_list: D001688:Biological Products