Cells - Stock Photos, Royalty Free Images

Brucella bacteria, illustration. Gram-negative pleomorphic bacteria that cause brucellosis in cattle and humans and are transmitted to humans by direct contact with ill animal or by contaminated milk.

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

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

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

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

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

Cerebellum tissue, light micrograph. Haematoxylin and eosin stain.

Human bone marrow, light micrograph. Haematoxylin and eosin stain.

Light micrograph of a cross sections of monocot stem.

Purple Macrophage, computer illustration

Coloured scanning electron micrograph (SEM) of Pediculus humanus capitis, human head lice. P. humanus is divided into two subspecies; the head louse P. humanus capitis and the body louse P. humanus corporis

Conceptual illustration of viral encephalitis is an inflammation of the brain caused by a virus.

Human lung tissue, light micrograph. Lungs are the primary organs of the respiratory system in humans and many other animals. Haematoxylin and eosin stain.

3d illustration of Pseudomonas aeruginosa bacteria showing internal structure. These Gram-negative rod-shaped bacteria are found in soil, water and as normal flora in the human intestine

Macrophage (purple) and cancer cells (red), illustration.

Conceptual illustration of viral encephalitis is an inflammation of the brain caused by a virus.

3d illustration of Coxiella burnetii bacteria. This bacterium affects humans and other animals such as cattle, sheep, goats, cats and dogs. It is the cause of Q fever, a highly infectious, influenza-like, febrile illness

Human smooth muscle, light micrograph. Haematoxylin and eosin stain.

Zebrafish young. Coloured scanning electron micrograph (SEM) of newly-hatched zebrafish (Danio rerio) young or fry. These fish are used to study embryonic development. The eyes (blue) are seen in the heads. Zebrafish eggs are transparent

Thyroid cancer cells, illustration.

Stomach lining. Coloured scanning electron micrograph (SEM) of the glandular lining (mucosa) of the stomach. The gastric mucosa secretes the digestive enzymes and hydrochloric acid

Activated platelets in blood flow, illustration.

Zebrafish young. Coloured scanning electron micrograph (SEM) of newly-hatched zebrafish (Danio rerio) young or fry. These fish are used to study embryonic development. The eyes (red) are seen in the heads. Zebrafish eggs are transparent

Blood clot, computer illustration

Hepatocyte cells, light micrograph. Hepatocyte cells are the main parenchymal tissue cells of the liver. Haematoxylin and eosin stain.

Activated platelets in a blood smear with red blood cells, illustration.

Scale insects. Coloured scanning electron micrograph (SEM) of scale insects (superfamily Coccoidea) on a leaf. This pest feeds on the plant's sap. It secretes a powdery wax coating that protects it against pesticides and predators

Tetanus bacteria, illustration. Clostridium tetani is a gram-positive, spore-forming, anaerobic bacillus (rod-shaped bacterium) that causes tetanus. Members of the Clostridium genus exist as soil saprophytes and as intestinal parasites of animals

Cancer cells, computer illustration

Human lip. Coloured scanning electron micrograph (SEM) of a human lip, showing sweat gland openings on the drier external lip surface. These openings (pores) release sweat onto the surface of the skin

T-cells (turquoise) binding to cancer cells (pink), illustration. T-lymphocytes, or T-cells, are a type of white blood cell and components of the body's immune system. They mature in the thymus

Human eye nerve, light micrograph. Haematoxylin and eosin stain.

Activated platelets, computer illustration

Blood clot, computer illustration

Illustration of lymphocytosis, showing abundant white blood cells inside blood vessel.

Gall bladder. Coloured scanning electron micrograph (SEM) of the surface of a gall bladder. This mucosa lining is made up of cuboidal epithelial cells (green)

Stomach lining. Coloured scanning electron micrograph (SEM) of the glandular lining (mucosa) of the stomach. The gastric mucosa secretes the digestive enzymes and hydrochloric acid

Didinium sp. ciliate protozoa, coloured scanning electron micrograph (SEM). These tiny single-celled organisms are found in freshwater and marine habitats. They are predatory organism, feeding on other ciliate protozoans, mainly Paramecium

Tendon fibroblast, light micrograph. Haematoxylin and eosin stain.

PRD1 bacteriophage, illustration. Molecular model of the structure of a PRD1 bacteriophage. Bacteriophages are viruses that infect bacteria

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

Blood clot, computer illustration

Ant head. Coloured scanning electron micrograph (SEM) of the head of an ant (family Formicidae). showing its large compound eyes (red) and jaws. Magnification: x50 when printed 10 centimetres wide.

Blood clot, computer illustration

Illustration of a dendritic cell (centre, purple) activating T-cells (teal). Dendritic cells recognise viruses and present information about their antigens to T-cells

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

Close-up of T-cells (turquoise) binding to cancer cells (pink), illustration. T-lymphocytes, or T-cells, are a type of white blood cell and components of the body's immune system. They mature in the thymus

Root vascular tissue, light micrograph.

Illustration of Neisseria gonorrhoeae bacteria. This Gram-negative bacteria causes the sexually transmitted infection gonorrhoea. Symptoms include a vaginal or urethral discharge and a burning sensation on urination

Hair follicles. Coloured scanning electron micrograph (SEM). The outer layer of hair (the cuticle) has overlapping scales of keratin. These scales are thought to prevent hairs from matting together

Light micrograph of a colon biopsy from a colonoscopy. The pathology report describes normal colonic mucosa fragment with colic glands. Haematoxylin and eosin stain.

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

Komodo dragon skin, coloured scanning electron micrograph (SEM). The Komodo dragon (Varanus komodoensis) has armoured scaly skin. It is the largest lizard in the world, reaching over three metres in length

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

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

Light micrograph of Dicot plants stem showing plant vascular tissue.

Didinium sp. ciliate protozoa, coloured scanning electron micrograph (SEM). These tiny single-celled organisms are found in freshwater and marine habitats

Human blood cells, light micrograph.

Dust mite, light micrograph

Hepatocyte cells, light micrograph. Hepatocyte cells are the main parenchymal tissue cells of the liver. Haematoxylin and eosin stain.