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    Colored scanning electron micrograph of sectioned seminiferous tubule, site of sperm production in human testes. — Stock Photo
    Colored scanning electron micrograph of sectioned seminiferous tubule, site of sperm production in human testes.
    Colored scanning electron micrograph of pollen grain cell from hollyhock hibiscus flower. — Stock Photo
    Colored scanning electron micrograph of pollen grain cell from hollyhock hibiscus flower.
    Colored scanning electron micrograph of pollen grains from Nymphaeaceae water lily flower. — Stock Photo
    Colored scanning electron micrograph of pollen grains from Nymphaeaceae water lily flower.
    Fertilisation of egg cell with spermatozoa, digital illustration. — Stock Photo
    Fertilisation of egg cell with spermatozoa, digital illustration.
    Pollen grains of mimosa flowers, digital illustration. — Stock Photo
    Pollen grains of mimosa flowers, digital illustration.
    Male Bluegill Triggerfish (Xanthichthys auromarginatus) with an erect spinous dorsal fin photographed under water off Maui, Hawaii, USA. He was circling above his prepared spawning area suggesting that this is a courtship display; Maui, Hawaii, Unite — Stock Photo
    Male Bluegill Triggerfish (Xanthichthys auromarginatus) with an erect spinous dorsal fin photographed under water off Maui, Hawaii, USA. He was circling above his prepared spawning area suggesting that this is a courtship display; Maui, Hawaii, Unite
    Passion flower pollen — Stock Photo
    Passion flower pollen
    Pollen grains from a bellflower — Stock Photo
    Pollen grains from a bellflower
    Organs comprising male reproductive system — Stock Photo
    Organs comprising male reproductive system
    Fertilisation of egg cell with spermatozoa, digital illustration. — Stock Photo
    Fertilisation of egg cell with spermatozoa, digital illustration.
    Rapeseed pollen grain — Stock Photo
    Rapeseed pollen grain
    Sperm cell, or spermatozoa — Stock Photo
    Sperm cell, or spermatozoa
    Geranium sp. pollen grain — Stock Photo
    Geranium sp. pollen grain
    Sperm fertilising an egg — Stock Photo
    Sperm fertilising an egg
    Three dimensional medical illustration of male reproductive system with veins and arteries — Stock Photo
    Three dimensional medical illustration of male reproductive system with veins and arteries
    Sperm fertilizing an egg cell — Stock Photo
    Sperm fertilizing an egg cell
    Colored scanning electron micrograph of pollen grains from convolvulus flower. — Stock Photo
    Colored scanning electron micrograph of pollen grains from convolvulus flower.
    Geranium pollen grain — Stock Photo
    Geranium pollen grain
    Human Fertilisation, computer illustration — Stock Photo
    Human Fertilisation, computer illustration
    Sperm cells, abstract digital illustration. — Stock Photo
    Sperm cells, abstract digital illustration.
    Coloured scanning electron micrograph (SEM) of an anther (male reproductive part) from a bay tree (Laurus nobilis) flower. — Stock Photo
    Coloured scanning electron micrograph (SEM) of an anther (male reproductive part) from a bay tree (Laurus nobilis) flower.
    Antelope buck and doe in a grass field during rut; South Dakota, United States of America — Stock Photo
    Antelope buck and doe in a grass field during rut; South Dakota, United States of America
    Human sperm cells, abstract computer illustration. — Stock Photo
    Human sperm cells, abstract computer illustration.
    Human sperm cells, abstract computer illustration. — Stock Photo
    Human sperm cells, abstract computer illustration.
    Sperm in a fallopian tube. Coloured composition scanning electron micrograph (SEM) of human sperm travelling through a fallopian tube (oviduct) of a female — Stock Photo
    Sperm in a fallopian tube. Coloured composition scanning electron micrograph (SEM) of human sperm travelling through a fallopian tube (oviduct) of a female
    Digital conceptual illustration of fertilisation of egg cell with spermatozoa. — Stock Photo
    Digital conceptual illustration of fertilisation of egg cell with spermatozoa.
    Fertilisation of egg cell with spermatozoa, digital illustration. — Stock Photo
    Fertilisation of egg cell with spermatozoa, digital illustration.
    Passion flower pollen — Stock Photo
    Passion flower pollen
    Gonorrhoea infection causing by bacteria Neisseria gonorrhoeae in male organ while urethritis, digital illustration. — Stock Photo
    Gonorrhoea infection causing by bacteria Neisseria gonorrhoeae in male organ while urethritis, digital illustration.
    Human sperm cells, abstract computer illustration. — Stock Photo
    Human sperm cells, abstract computer illustration.
    Human Fertilisation, computer illustration — Stock Photo
    Human Fertilisation, computer illustration
    Milkwort pollen grain — Stock Photo
    Milkwort pollen grain
    Digital conceptual illustration of fertilisation of egg cell with spermatozoa. — Stock Photo
    Digital conceptual illustration of fertilisation of egg cell with spermatozoa.
    Organs of reproductive system — Stock Photo
    Organs of reproductive system
    Male hand holding ultrasound transducer. — Stock Photo
    Male hand holding ultrasound transducer.
    Human papilloma virus — Stock Photo
    Human papilloma virus
    Human Fertilisation, computer illustration — Stock Photo
    Human Fertilisation, computer illustration
    Sperm cell in a fallopian tube — Stock Photo
    Sperm cell in a fallopian tube
    Pollen grains from a bellflower — Stock Photo
    Pollen grains from a bellflower
    Primrose (Primula sp.) pollen grain, coloured scanning electron micrograph (SEM). — Stock Photo
    Primrose (Primula sp.) pollen grain, coloured scanning electron micrograph (SEM).
    Digital conceptual illustration of fertilisation of egg cell with spermatozoa. — Stock Photo
    Digital conceptual illustration of fertilisation of egg cell with spermatozoa.
    Coho Salmon, also known as Silver Salmon (Oncorhynchus kisutch) in the act of spawning in an Alaskan stream during autumn; Alaska, United States of America — Stock Photo
    Coho Salmon, also known as Silver Salmon (Oncorhynchus kisutch) in the act of spawning in an Alaskan stream during autumn; Alaska, United States of America
    Organs comprising male reproductive system — Stock Photo
    Organs comprising male reproductive system
    Human Fertilisation, computer illustration — Stock Photo
    Human Fertilisation, computer illustration
    Digital conceptual illustration of fertilisation of egg cell with spermatozoa. — Stock Photo
    Digital conceptual illustration of fertilisation of egg cell with spermatozoa.
    Antelope buck in a grass field during rut; South Dakota, United States of America — Stock Photo
    Antelope buck in a grass field during rut; South Dakota, United States of America
    Immature dog sperm — Stock Photo
    Immature dog sperm
    Gonorrhoea infection causing by bacteria Neisseria gonorrhoeae in male organ while urethritis, digital illustration. — Stock Photo
    Gonorrhoea infection causing by bacteria Neisseria gonorrhoeae in male organ while urethritis, digital illustration.
    Angel trumpets pollen grain — Stock Photo
    Angel trumpets pollen grain
    Immature dog sperm — Stock Photo
    Immature dog sperm
    Antelope bucks and doe in a grass field during rut; South Dakota, United States of America — Stock Photo
    Antelope bucks and doe in a grass field during rut; South Dakota, United States of America
    Sperm fertilising an egg — Stock Photo
    Sperm fertilising an egg
    Strawberry pollen grain — Stock Photo
    Strawberry pollen grain
    Male reproductive system, illustration. — Stock Photo
    Male reproductive system, illustration.
    Skimmia sp. pollen grain — Stock Photo
    Skimmia sp. pollen grain
    Coloured scanning electron micrograph (SEM) of immature dog sperm. — Stock Photo
    Coloured scanning electron micrograph (SEM) of immature dog sperm.
    Milkwort pollen grain — Stock Photo
    Milkwort pollen grain
    Sperm cells, abstract digital illustration. — Stock Photo
    Sperm cells, abstract digital illustration.
    Fertilisation of egg cell with spermatozoa, digital illustration. — Stock Photo
    Fertilisation of egg cell with spermatozoa, digital illustration.
    Angel trumpets pollen — Stock Photo
    Angel trumpets pollen