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    Prostate cancer cell, coloured scanning electron micrograph. — Stock Photo
    Prostate cancer cell, coloured scanning electron micrograph.
    Abstract illustration of bacilli bacteria, full frame. — Stock Photo
    Abstract illustration of bacilli bacteria, full frame.
    Medical illustration of alveoli on black background — Stock Photo
    Medical illustration of alveoli on black background
    Illustration of blue cell membrane on white background. — Stock Photo
    Illustration of blue cell membrane on white background.
    3d illustration of sperm cells frozen into ice cubes. — Stock Photo
    3d illustration of sperm cells frozen into ice cubes.
    Shell of a radiolarian — Stock Photo
    Shell of a radiolarian
    Digital illustration of Enterobacteriaceae Gram-negative rod-shaped bacteria. — Stock Photo
    Digital illustration of Enterobacteriaceae Gram-negative rod-shaped bacteria.
    Illustration of pink stem cells on white background. — Stock Photo
    Illustration of pink stem cells on white background.
    Coloured scanning electron micrograph of Phasmarhabditis hermaphrodita microscopic nematode parasite of Rhabditidae. — Stock Photo
    Coloured scanning electron micrograph of Phasmarhabditis hermaphrodita microscopic nematode parasite of Rhabditidae.
    Pleurotaenium desmid bacteria — Stock Photo
    Pleurotaenium desmid bacteria