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Percentage of grade I embryos derived from “mature egg follicles” (n = 84) stratified by tertiles according to all-trans retinoic acid (ATRA) or retinol (ROL) concentrations. Percentage of grade I follicles = number of grade I follicles/28 (number of mature egg follicles in each tertile). aSignificant difference between labeled values at P < .005.
