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Histological sections of control eggs after fertilization. A (10 min after fertilization: af): second polar body released and egg nucleus present just underneath the polar body; B (10 min af): condensed sperm nucleus; C (20 min af): decondensed female and male pronuclei; D (30 min af): metaphase of first cleavage; E (40 min af): anaphase of first cleavage; F (50 min af): prophase of second cleavage. Scale bars denote 10 μm.
