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ZIFT   Zygote Intra Fallopian Transfer (same as PROST)   Zona pellucida   The outer covering of the ovum that the sperm must penetrate before fertilization can occur.   Zygote   An embryo in early development state. An embryo that has not yet cleaved.   Zygote intrafallopian transfer (ZIFT)   Transfer of a zygote into a Fallopian tube, usually done by laparoscopy.