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Thyroid gland showing the follicles

Scanning electron micrograph of bacteria cultured from sample of human faeces.

Coloured scanning electron micrograph (SEM) of the shell of the foraminiferan Orbulina sp.

Hand of a patient with osteoarthritis

Blood clotting in an ovarian follicle

Hip before hip replacement surgery, X-ray

Angel trumpets pollen grain

Human hair shafts, digital illustration.

Campylobacter jejuni bacteria

Fungal cells and sporangia

Colored scanning electron micrograph of immature pig sperm from epididymis.

Bougainvillea pollen grain

Dog hair, coloured scanning electron micrograph (SEM).In dogs several hairs emerge from a single follicle.

Colored scanning electron micrograph of pollen grain cell from hollyhock hibiscus flower.

Mixed oral bacteria

Red blood cells. Coloured scanning electron micrograph (SEM) of red blood cells (RBCs, erythrocytes). Red blood cells are biconcave, disc-shaped cells that transport oxygen from the lungs to body cells

Centric fossil diatom frustule

Flowering currant pollen

Wasp eye numerous lenses

Colored X-ray of section through thoracic spine of senior male patient with ankylosing spondylitis with severe degeneration of lower thoracic spine.

Streptomyces coelicoflavus bacteria

Nanoscale spikes formed on gold surface

Coloured scanning electron micrograph of surface of prostate cancer cells.

Coloured scanning electron micrograph of Phasmarhabditis hermaphrodita microscopic nematode parasite of Rhabditidae.

Phytoplankton diatom Coscinodiscus sp

Peony (Paeonia suffruticosa), coloured X-ray

Tendon, coloured scanning electron micrograph showing bundles of collagen fibres.

Poppy (Papaver orientalis), coloured X-ray

$Coloured scanning electron micrograph (SEM) of a freeze fracture of the vagina showing the stratified squamous epithelium and the underlying lamina propria — Stock Photo$

Coloured scanning electron micrograph (SEM) of a freeze fracture of the vagina showing the stratified squamous epithelium and the underlying lamina propria

Colored scanning electron micrograph of sectioned seminiferous tubule, site of sperm production in human testes.

Normal elbow joint anatomy

Skin cancer cell

Colored scanning electron micrograph of pollen grains from marigold flower.

Stagnant water bacteria

Human hair, coloured scanning electron micrograph (SEM).

Trachea lining. Coloured transmission electron micrograph (TEM) of a longitudinal section through the lining of the trachea (windpipe), which links the larynx (voicebox) to the lungs

$Nerve. Coloured scanning electron micrograph (SEM) of a freeze-fracture through a peripheral nerve. Schwann cells wraps their cell membrane around the nerve a number of times — Stock Photo$

Nerve. Coloured scanning electron micrograph (SEM) of a freeze-fracture through a peripheral nerve. Schwann cells wraps their cell membrane around the nerve a number of times

Dividing prostate cancer cells, coloured scanning electron micrograph.

$Snake red blood cells. Coloured scanning electron micrograph (SEM) of whole and fractured red blood cells (erythrocytes, red) in a small blood vessel of a snake — Stock Photo$

Snake red blood cells. Coloured scanning electron micrograph (SEM) of whole and fractured red blood cells (erythrocytes, red) in a small blood vessel of a snake

Coloured scanning electron micrograph of bacteria on surface of human tongue.

Silhouette with lungs pneumonia caused by measles virus, conceptual illustration.

Scanning electron microscopy of DNA molecules and red and white blood cells.

Lymphoma cancer cell

Coloured scanning electron micrograph of dividing Schizosaccharomyces pombe yeast cells.

Kidney glomerulus and podocyte cells

Deformed sperm cell

$Small intestine. Coloured scanning electron micrograph (SEM) of a freeze-fractured of the small intestine. The surface consists of deep folds, called villi. The intestinal surface( pink) is exposed to food — Stock Photo$

Small intestine. Coloured scanning electron micrograph (SEM) of a freeze-fractured of the small intestine. The surface consists of deep folds, called villi. The intestinal surface( pink) is exposed to food