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Tendon, coloured scanning electron micrograph (SEM), showing bundles of collagen fibres. The parallel alignment of the fibres make tendons inelastic but flexible. Tendons attach muscle to bone

Prostate cancer cells, coloured scanning electron micrograph.

House dust mites

Cells of brewer yeast

Sperm cells in seminiferous tubules

Acanthocystis. Coloured scanning electron micrograph (SEM) of a centrohelid heliozoan with tangential plate-scales and radial spines

Ornate ghost pipefish on sea fan

Skeletal muscle fibres

Bone cancer cells. Coloured scanning electron micrograph of osteosarcoma cancer cells. Osteosarcoma is an aggressive malignant neoplasm arising from primitive transformed mesenchymal cells

Activated blood cell fragments platelets, coloured scanning electron micrograph.

Heart capillary with red blood cell between muscle fibres, colored scanning electron micrograph.

Coloured coronary angiogram (X-ray) of a 59 year old patient with severe stenosis (narrowing) in the left anterior interventricular coronary artery (running down left) and the left circumflex artery (centre).

Cardiac muscle from a healthy heart

Normal human brain

Morphology of Activated platelets

$African American guy in latex gloves using mouth mirror and probe to check false teeth while working in modern laboratory — Stock Photo$

African American guy in latex gloves using mouth mirror and probe to check false teeth while working in modern laboratory

Digital illustration of Legionella pneumophila bacteria causing Legionnaires disease.

Scanning electron micrograph of bacterial culture from sputum.

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

Coloured scanning electron micrograph (SEM) of a tardigrade (Macrobiotus sp.), or water bear.

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

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

Brain with aneurysm in the middle cerebral artery

Mature virus and budding release of HIV

Coloured scanning electron micrograph (SEM) of a section through a vein in the liver, which is filled with red blood cells (erythrocytes, red).

Cannabis plant. Coloured scanning electron micrograph (SEM) of the surface of a cannabis (Cannabis sativa) plant. The pointed hairs are called lithocyst cells. They contain cystoliths (calcium carbonate crystals)

Young vain man in stylish wear with lady's purse standing on tiled wall while looking at camera

Coloured scanning electron micrograph (SEM) of Mould, hyphae, conidiophores (fruiting structures) and conidium (asexual spore) formation (Penicillium sp.;likely Penicillum candidum).

Coloured scanning electron micrograph of macrophage white blood cell.

Bacteria from a coin. Coloured scanning electron micrograph (SEM) of bacteria cultured from a english one pound coin

Female dentist cleaning dental jaw model with toothbrush in clinic

Alveolar macrophage phagocytosis of E. coli

Scorpion fly foot

Fungal cells revealing sporangium with spores

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

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