Yen & Jaffe has always been an evolving text, and that will continue to be one of its hallmarks. The ninth edition incorporates new chapters that cover advances in basic and clinical science that have enriched the field since publication of the previous edition, including emerging technologies involving gamete production and maturation, genetic testing and genetic manipulation, and uterus transplantation. Other chapters have been extensively revised to cover contemporary practices in assisted reproduction, fertility preservation, and ovulation induction.