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3 Embryos in grade 2 3[+ or -]2 Embryos in grade 3 0 Embryos in grade 4 0 Patients who had mature oocytes (MII) 21 (65%) Patients who had grade-1 embryos 16 (50%) Patients who had top-quality embryos (grades 1 and 2) 18 (56%) Patients whose embryos were transferred 19 (59%) Biochemical pregnancy 2 (6.