title: Return to sender.
mesh_terms: D000401:Aircraft; D032761:Animal Experimentation / Q000941:ethics; D017087:Animal Rights / Q000331:legislation & jurisprudence*; D000818:Animals; D000830:Animals, Laboratory; D035843:Biomedical Research / Q000193:education / Q000379:methods; D004331:Drosophila melanogaster; D010565:Persuasive Communication; D012108:Research Personnel; D012377:Rodentia; D014186:Transportation / Q000331:legislation & jurisprudence*; D014981:Xenopus