title: [In vitro fertilization and human embryo transfer: biological problems].
abstract: Optimal results in in-vitro fertilisation procedures can only be achieved using both meiotic competent, mature oocytes and spermatozoa with a high fertilization potential. This situation is not verified in the overwhelming number of couples submitting to IVF-ET. Many of the steps in the gametes maturation processes need to be urgently clarified in order to reach optimal fertilization rates.
mesh_terms: D004624:Embryo Transfer; D005260:Female; D005307:Fertilization in Vitro; D006801:Humans; D008297:Male; D009865:Oocytes / Q000254:growth & development; D011247:Pregnancy; D013084:Sperm-Ovum Interactions; D013091:Spermatogenesis
vernacular_title: Fécondation in vitro et transfert d'embryons humains: problèmes biologiques.