* REASON: To prepare the [[Female_Reproductive_Tract_-The_Uterus_- Anatomy & Physiology|uterus]] of the recipient to support [[Blastocyst Embryonic Development - Anatomy & Physiology|preattachment embryogenesis]]. | * REASON: To prepare the [[Female_Reproductive_Tract_-The_Uterus_- Anatomy & Physiology|uterus]] of the recipient to support [[Blastocyst Embryonic Development - Anatomy & Physiology|preattachment embryogenesis]]. |