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40363 Kirtlandia vagrans - Egg with blastoderm showing germ ring (GR) fully differentiated and an early stage in differentiation of Stock Photo - Alamy
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Gambusia Affinis: Ovum with blastoderm, showing embryonic shield; ES, embryonic shield; EA, embryonic aria; GR, germ ring - Freshwater and Marine Image Bank - University of Washington Digital Collections
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