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The aimoftheHypospadiasand Genital Symposium, held at theUniversityof California,SanFrancisco,wastoprovideaforumforauthoritativeinvestigatorswhoare activelyinvolvedinthevariousdisciplineswhichdefinetheleadingedgesofhypospadias and genital research. It is important for such investigators to continue to meet for the purpose of discussing the latest developments in their individual fields, to analyze the significanceofcurrent research, to discuss new tactics for unresolved problems and to develop new theories andapproaches asneeded. The two day conference on hypospadiasandgenitaldevelopment research was organizedintothreesections: 1)HumanStudies;2)MechanismofGenitalDevelopment; and 3) Endocrine Disruptors and Sexual Dimorphism in the Animal Kingdom. Each sessionwasintroducedbyanexpertmoderatorfollowedtheinvitedspeakerswithtimefor extensiveinteractionbetweeninvestigators. Thisbookdocumentstheproceedingsofthe HypospadiasandGenitalDevelopmentSymposium. Iwould especially like to thank Kari Gaudette for editorial assistants, Cynthia Ashe, Selcuk Yucel, Antonio Souza and the administrative staffinthe Departmentof Urology. Ihopeyoufindthisresourceuseful. Laurence S. Baskin,M. D. ProgramChair ChiefPediatricUrology UCSF vii ACKNOWLEDGEMENTS Supportforthissymposiumisgratefullyacknowledged TheNationalInstituteofHealthGrant#R13DK*HDS997 UCSFDepartmentofUrology AmericanUrologicAssociation CONTENTS Introduction...1 SECTIONI. HUMANSTUDIES EpidemiologyofHypospadias...*...*...25 J. DavidErickson EndocrineEvaluationofHypospadias...31 G. HyunandT. Kolon EndocrineAbnormalitiesinBoyswithHypospadias...45 R. I. Silver GeneticandClinicalStudiesonHypospadias...***...**...*...73 A. Nordenskjold SECTIONII. MECHANISMOFGENITALDEVELOPMENT DevelopmentofthePenileUrethra. . 87 G. CunhaandL. Baskin AnatomicalStudiesoftheMouseGenitalTubercle...103 L. Baskin,W. Liu,J. Bastacky,andS. Yucel AnatomicalStudiesoftheFibroblastGrowthFactor-l0Mutant,Sonic HedgeHogMutant,andAndrogenReceptorMutantMouseGenital Tubercle...*. **. . 123 S. Yllcel,W. Liu,DCordero,A. Donjacour,G. Cunha,andL. Baskin DevelopmentalGeneticsofHypospadias...149 M. Cohn xiii xiv Contents DevelopmentoftheMouseExternalGenitalia: UniqueModelof Organogenesis...159 K. Suzuki, K. Shiota,Y. Zhang,L. Lei,andG. Yamada NewConceptsontheDevelopmentoCtheVagina...173 E. Shapiro. H. Huang,andX. R. Wu SECTIONIII. ENDOCRINEDISRUPTORSANDSEXUAL DIMORPHISMINTHEANIMALKINGDOM EndocrineDisruptionOverview: AreMalesatRisk? 189 T. Colburn EndocrineDisruptionandHypospadias...203 G. Steinhardt Toxicant-InducedHypospadiasintheMaleRat * 217 L. E. Gray. . I. Ostby,J. Fun,C. Wolf,C. Lambright,V. Wilson, and N. Noreiga MasculinizationofFemaleMammals: LessonsfromNature...243 N. J. PI:H'candS. Glickman Index...255 SectionI Introduction HYPOSPADIAS LaurenceS. Baskin* M. D. ,FAAP 1.

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