title: Protection priority.
mesh_terms: D032761:Animal Experimentation / Q000941:ethics / Q000592:standards*; D017087:Animal Rights / Q000592:standards*; D000818:Animals; D035081:Editorial Policies; D005060:Europe; D017408:Guidelines as Topic; D009368:Neoplasm Transplantation / Q000473:pathology*; D010506:Periodicals as Topic; D023041:Xenograft Model Antitumor Assays / Q000592:standards*