Use of in-vivo and in-vitro embryos in ART (1) Embryo formed by in-vivo fertilisation can be used for intra uterine transfer (2) Embryo formed by in-vivo fertilisation can be transferred at more than eight blastomere stage (3) In ZIFT, fully formed embryo is transferred into fundus region of uterus (4) In IUT, embryos are transferred into the uterus