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机译:The human sex ratio from conception to birth
Reprogenet, Livingston, NJ 07039 USA;
Genzyme Genet, Westborough, MA 01581 USA;
Univ Oxford, Oxford OX1 3TG, EnglandHarvard Univ, Sch Med, Boston, MA 02115 USAFresh Pond Res Inst, Cambridge, MA 02140 USA;