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Representative Hoffman modulation contrast images of rhesus macaque embryos of XXO-treated sperm. a) Normal-appearing two-cell embryo. b) Two-cell embryo with moderate amounts of blastomere fragmentation. c) Four-cell embryo with a few small fragments and demonstrating blastomeres not filling intrazonal space. d) Three-cell embryo at Day 2 with extensive fragmentation. Original magnification ×400.
