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Spermatozoa, in this case human, are a primary component in normal semen, and the agents of fertilization of female ova.
Spermatozoa, in this case human, are a primary component in normal semen, and the agents of fertilization of female ova.
Human semen in a Petri dish
Human semen in a Petri dish
Semen stain on carpet observed with and without ultraviolet light
Semen stain on carpet observed with and without ultraviolet light
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A breeding mount with built-in artificial vagina used to collect semen from horses for use in artificial insemination
A breeding mount with built-in artificial vagina used to collect semen from horses for use in artificial insemination
Dog sperm collection
Dog sperm collection