AmifostineCytoprotectionRadiation-Protective AgentsMercaptoethylamines16,16-Dimethylprostaglandin E2Heme Oxygenase-1Protective AgentsXerostomiaRadiation InjuriesHydrochloric AcidCell SurvivalApoptosisRadiation Injuries, ExperimentalHeme Oxygenase (Decyclizing)Testicular DiseasesMicroradiographyStomatitisNF-E2-Related Factor 2Gastric Mucosa