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1950s: Microscopic creatures magnified moving. Sperm moving toward egg.
Human spermatozoa under microscope. Testing in laboratory
Human spermatozoa under microscope. Testing in laboratory
Sperm sea urchin Strongylocentrotus pallidus under microscope, phylum Echinodermata. White sea
Human spermatozoa under microscope. Testing in laboratory
Sperm of Worm Polychaeta Nereis virens (Alitta virens) under microscope, family Nereididae. White Sea
Sperm of Worm Polychaeta Nereis virens (Alitta virens) under microscope, family Nereididae. White Sea

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Human spermatozoa under microscope. Testing in laboratory

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