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    Thyroid gland showing the follicles — Stock Photo
    Thyroid gland showing the follicles
    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
    PC12 neurone in culture — Stock Photo
    PC12 neurone in culture
    Cells undergoing mitosis — Stock Photo
    Cells undergoing mitosis
    Parasitic trematode larva — Stock Photo
    Parasitic trematode larva
    Micrograph of house fly — Stock Photo
    Micrograph of house fly
    Section of a flower bud — Stock Photo
    Section of a flower bud
    Blood cells in a blood vessel — Stock Photo
    Blood cells in a blood vessel
    Fertilization of human egg — Stock Photo
    Fertilization of human egg
    Pit formed on metal or semiconductor surface — Stock Photo
    Pit formed on metal or semiconductor surface
    Undifferentiated pleomorphic sarcoma of bone — Stock Photo
    Undifferentiated pleomorphic sarcoma of bone
    Coloured scanning electron micrograph of Staphylococcus aureus bacteria. — Stock Photo
    Coloured scanning electron micrograph of Staphylococcus aureus bacteria.
    Bacteria found in a sample of human faeces — Stock Photo
    Bacteria found in a sample of human faeces
    Diatoms single-celled algae — Stock Photo
    Diatoms single-celled algae
    Phytoplankton diatom Coscinodiscus sp — Stock Photo
    Phytoplankton diatom Coscinodiscus sp
    Coloured scanning electron micrograph of Staphylococcus aureus bacteria. — Stock Photo
    Coloured scanning electron micrograph of Staphylococcus aureus bacteria.
    Streptomyces coelicoflavus bacteria — Stock Photo
    Streptomyces coelicoflavus bacteria
    Dendritic cells of immune system — Stock Photo
    Dendritic cells of immune system
    Simple columnar epithelium, digital illustration. — Stock Photo
    Simple columnar epithelium, digital illustration.
    Asparagus beetle head — Stock Photo
    Asparagus beetle head
    Components of house dust — Stock Photo
    Components of house dust
    Marine planktonic unicellular alga — Stock Photo
    Marine planktonic unicellular alga
    Nanoscale spikes formed on gold surface — Stock Photo
    Nanoscale spikes formed on gold surface
    Human eyelash mites — Stock Photo
    Human eyelash mites
    Bacteria found in a sample of human faeces — Stock Photo
    Bacteria found in a sample of human faeces
    Activated T lymphocytes and red blood cells on scanning electron micrograph. — Stock Photo
    Activated T lymphocytes and red blood cells on scanning electron micrograph.
    Simple columnar epithelium, digital illustration. — Stock Photo
    Simple columnar epithelium, digital illustration.
    House dust mites — Stock Photo
    House dust mites
    Od shaped bacteria Tragelaphus — Stock Photo
    Od shaped bacteria Tragelaphus
    Centric fossil diatom frustule — Stock Photo
    Centric fossil diatom frustule
    Immature parasitic trematode — Stock Photo
    Immature parasitic trematode
    Male sex cell — Stock Photo
    Male sex cell
    Scientists looking at scanning electron micrographs of different nanofibre structures. — Stock Photo
    Scientists looking at scanning electron micrographs of different nanofibre structures.
    Morphology of Activated platelets — Stock Photo
    Morphology of Activated platelets
    Villi from the lining of the jejunum — Stock Photo
    Villi from the lining of the jejunum
    Male sex cell — Stock Photo
    Male sex cell
    Sperm cell with multiple tails — Stock Photo
    Sperm cell with multiple tails
    Wasp eye numerous lenses — Stock Photo
    Wasp eye numerous lenses
    Dendritic cells of immune system — Stock Photo
    Dendritic cells of immune system
    Sensory palps of Rabbit flea — Stock Photo
    Sensory palps of Rabbit flea
    Eupodiscus sculptus diatom — Stock Photo
    Eupodiscus sculptus diatom
    Male mosquito head — Stock Photo
    Male mosquito head
    Woodland skipper butterfly compound eye — Stock Photo
    Woodland skipper butterfly compound eye
    Coloured scanning electron micrograph (SEM) of the shell of the foraminiferan Orbulina sp. — Stock Photo
    Coloured scanning electron micrograph (SEM) of the shell of the foraminiferan Orbulina sp.
    Scientist pointing at scanning electron micrographs of different nanofibre structures. — Stock Photo
    Scientist pointing at scanning electron micrographs of different nanofibre structures.
    Light microscope objective lenses in laboratory. — Stock Photo
    Light microscope objective lenses in laboratory.
    Human head louse — Stock Photo
    Human head louse
    Streptomyces coelicoflavus bacteria — Stock Photo
    Streptomyces coelicoflavus bacteria
    Stagnant water bacteria — Stock Photo
    Stagnant water bacteria
    Mixed oral bacteria — Stock Photo
    Mixed oral bacteria
    Coiled proboscis of a moth — Stock Photo
    Coiled proboscis of a moth
    Alveolar macrophage phagocytosis of E. coli — Stock Photo
    Alveolar macrophage phagocytosis of E. coli
    Finger-like projections of the duodenum — Stock Photo
    Finger-like projections of the duodenum
    House dust mites — Stock Photo
    House dust mites
    Villi from the lining of the jejunum — Stock Photo
    Villi from the lining of the jejunum
    Osteosarcoma cancer cell — Stock Photo
    Osteosarcoma cancer cell
    Phytoplankton diatom Coscinodiscus sp — Stock Photo
    Phytoplankton diatom Coscinodiscus sp