title: Selectivity--key to chemotherapy: presidential address.
mesh_terms: D000212:Acyclovir / Q000378:metabolism / Q000627:therapeutic use; D000493:Allopurinol / Q000627:therapeutic use; D000818:Animals; D004358:Drug Therapy; D005493:Folic Acid Antagonists; D006561:Herpes Simplex / Q000188:drug therapy; D006562:Herpes Zoster / Q000188:drug therapy; D006801:Humans; D007891:Leishmania / Q000187:drug effects; D015122:Mercaptopurine / Q000627:therapeutic use; D009369:Neoplasms / Q000188:drug therapy; D019384:Nucleic Acid Synthesis Inhibitors; D012008:Recurrence; D013045:Species Specificity
chemical_list: D005493:Folic Acid Antagonists; D019384:Nucleic Acid Synthesis Inhibitors; D000493:Allopurinol; D015122:Mercaptopurine; D000212:Acyclovir