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Human red blood cells trapped in a fibrin blood clot, coloured scanning electron micrograph (SEM).

Rapeseed pollen grain

Non-activated blood cell fragments platelets, coloured scanning electron micrograph.

Scanning electron micrograph of head of pork tapeworm intestinal parasite.

Mouse mammary tumour virus (MMTV) particles (blue), coloured transmission electron micrograph (TEM). MMTV induces malignant tumours in the mammary glands of certain strains of laboratory mice

Chlamydia bacteria, illustration

Colored scanning electron micrograph of immature pig sperm from epididymis.

Carcinoma cell, coloured transmission electron micrograph (TEM).

Colored digital illustration of parasitic dust mites.

Coloured scanning electron micrograph (SEM) of sensory inner hair cells from the organ of corti, in the cochlea of the inner ear.

Dividing prostate gland cancer cells, colored scanning electron micrograph.

Colored digital illustration of parasitic dust mites.

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

Conductive vessel element in mountain mahogany wood (Cercocarpus sp), coloured scanning electron micrograph (SEM).

Escherichia coli bacteria

Pyoderma skin disease

Pollen threads and brochosomes

Diatoms single-celled algae

Colored scanning electron micrograph of pollen grains from Nymphaeaceae water lily flower.

Soil bacteria, coloured scanning electron micrograph.

Caterpillar hairs. Coloured scanning electron micrograph (SEM) of hairs from the vapourer moth (Orgyia antiqua) caterpillar.

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

Nanoscale spikes formed on gold surface

Coloured scanning electron micrograph (SEM) of the shell (test) of a Globigerina sp. planktonic foraminiferan.

Dust mite parasite, microscopic digital illustration.

Kidney glomerulus and podocyte cells

$Coloured scanning electron micrograph (SEM) of a freeze-fractured water lily stem showing numerous vascular bundles (blue) and large intercellular air spaces (holes). — Stock Photo$

Coloured scanning electron micrograph (SEM) of a freeze-fractured water lily stem showing numerous vascular bundles (blue) and large intercellular air spaces (holes).

Coloured scanning electron micrograph (SEM) of squamous epithelial cells on the skin surface.

Colored digital illustration of parasitic dust mites.

Red blood cells aggregated

Dividing prostate cancer cells, coloured scanning electron micrograph.

Sperm cell with multiple tails

Coloured scanning electron micrograph of breast cancer cell.

Micrograph of tendon fibres

Cat flea head

Plankton. Coloured scanning electron micrograph (SEM) of plankton containing mainly Ceratium dinoflagellates. A few diatoms are also present. Dinoflagellates are unicellular protozoans

$Coloured scanning electron micrograph (SEM) of a freeze-fractured Nasturtium stem, showing numerous vascular bundles (such as at upper centre) with an inner xylem (pink) and outer phloem (yellow). — Stock Photo$

Coloured scanning electron micrograph (SEM) of a freeze-fractured Nasturtium stem, showing numerous vascular bundles (such as at upper centre) with an inner xylem (pink) and outer phloem (yellow).

Dental plaque scanning electron micrograph

Prostate cancer cells, coloured scanning electron micrograph.

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

Three dinoflagellates (blue), coloured scanning electron micrograph (SEM). Dinoflagellates are unicellular protozoans.

Skin blood vessel. Coloured scanning electron micrograph (SEM) of a blood vessel (arteriole) in the dermis of the skin. In the blood vessel are red blood cells (erythrocytes, red) which carry oxygen around the body

Coloured scanning electron micrograph (SEM) of Asbestos fiberschrysotile type.

Coloured scanning electron micrograph (SEM) of the interior of bone from a bird skull.

Composite image of nasal epithelium and pollen. Coloured Scanning Electron Micrograph (SEM) of the surface of nasal epithelium with inhaled in pollen.

Fat cell. Coloured scanning electron micrograph (SEM) of part of a fat-storing cell (adipocytes). Fat cells are one of the largest cell types in the human body, each cell being 100 to 120 microns in diameter

$Coloured scanning electron micrograph (SEM) of a section through fractured skeletal muscle to show large muscle bundles, or fascicles (green), surrounded by perimysium connective tissue (pink). — Stock Photo$

Coloured scanning electron micrograph (SEM) of a section through fractured skeletal muscle to show large muscle bundles, or fascicles (green), surrounded by perimysium connective tissue (pink).