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In order for implantation to take place, the developing embryo must escape from a surrounding membrane know as the zona pellucida. This process is called “hatching.” While this normally occurs when the embryo is in the uterus, it is believed that on occasion the embryo is unable to hatch and, therefore, cannot implant. Assisted hatching (AH) involves the creation of a small hole in the embryo shell (zona pellucida) with the use of a dilute chemical solution under a microscope.