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Human sperm swimming, Phase contrast

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Human sperm, lots swimming around, red brown background

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Human sperm, masses swimming around, wide locked off

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Human sperm, single sperm swimming, makes good progress

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Human sperm, masses swimming, tilt down to sperm all around egg-like sphere

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Human sperm, masses swimming, tilt down to sperm all around edge of egg-like sphere

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Human sperm, single sperm swimming but not getting very far

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Human sperm swimming, Phase contrast

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Human sperm

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Human sperm swimming amongst semen plasma, Interference contrast

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Human sperm, single sperm swimming, makes good progress

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