title: The incredible shrinking chalone.
mesh_terms: D000818:Animals; D002417:Cattle; D002455:Cell Division; D006087:Graft vs Host Reaction; D006131:Growth Inhibitors / Q000302:isolation & purification / Q000502:physiology*; D007165:Immunosuppression Therapy; D008198:Lymph Nodes / Q000502:physiology; D008213:Lymphocyte Activation; D008214:Lymphocytes / Q000502:physiology; D008970:Molecular Weight; D011073:Polyamines / Q000494:pharmacology; D013154:Spleen / Q000502:physiology; D013950:Thymus Gland / Q000502:physiology; D014184:Transplantation, Homologous
chemical_list: D006131:Growth Inhibitors; D011073:Polyamines