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    Immature dog sperm — Stock Photo
    Immature dog sperm
    Human stomach adenocarcinoma, computer illustration and light micrograph. — Stock Photo
    Human stomach adenocarcinoma, computer illustration and light micrograph.
    Tendon showing the parallel collagen fibres — Stock Photo
    Tendon showing the parallel collagen fibres
    Colored scanning electron micrograph of protective dendritic cell of immune system. — Stock Photo
    Colored scanning electron micrograph of protective dendritic cell of immune system.
    Feet bacteria. Coloured scanning electron micrograph (SEM) of bacteria cultured from between toes of foot — Stock Photo
    Feet bacteria. Coloured scanning electron micrograph (SEM) of bacteria cultured from between toes of foot
    Scanning electron micrograph of faecal bacteria cultured from sample of human faeces. — Stock Photo
    Scanning electron micrograph of faecal bacteria cultured from sample of human faeces.
    Coloured scanning electron micrograph of dividing Schizosaccharomyces pombe yeast cells. — Stock Photo
    Coloured scanning electron micrograph of dividing Schizosaccharomyces pombe yeast cells.
    Varicella zoster virus particle — Stock Photo
    Varicella zoster virus particle
    Chronic pyelonephritis, computer illustration and light micrograph — Stock Photo
    Chronic pyelonephritis, computer illustration and light 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
    Climbing lily pollen — Stock Photo
    Climbing lily pollen
    Secondary liver cancer — Stock Photo
    Secondary liver cancer
    Enterococcus coccoid bacteria, colored scanning electron micrograph. — Stock Photo
    Enterococcus coccoid bacteria, colored scanning electron micrograph.
    T lymphocyte cells attached to cancer cell — Stock Photo
    T lymphocyte cells attached to cancer cell
    Kidney with acute nephritis — Stock Photo
    Kidney with acute nephritis
    High power light micrograph (LM) of a section through the gills of a mushroom, Agaricus sp. (formerly Psalliota sp.). — Stock Photo
    High power light micrograph (LM) of a section through the gills of a mushroom, Agaricus sp. (formerly Psalliota sp.).
    Coloured scanning electron micrograph of 293T cell infected with human immunodeficiency virus. — Stock Photo
    Coloured scanning electron micrograph of 293T cell infected with human immunodeficiency virus.
    Iris stem cellular structure — Stock Photo
    Iris stem cellular structure
    Escherichia coli bacteria — Stock Photo
    Escherichia coli bacteria
    Leukaemia blood cells — Stock Photo
    Leukaemia blood cells
    Human cell infected with Simian Immunodeficiency Virus from sooty mangabey, colored scanning electron micrograph. — Stock Photo
    Human cell infected with Simian Immunodeficiency Virus from sooty mangabey, colored scanning electron micrograph.
    Escherichia coli bacteria on gecko tongue — Stock Photo
    Escherichia coli bacteria on gecko tongue
    Light micrograph of a section through the eye of a frog. — Stock Photo
    Light micrograph of a section through the eye of a frog.
    Squamous carcinoma of the skin — Stock Photo
    Squamous carcinoma of the skin
    Crenated red blood cells — Stock Photo
    Crenated red blood cells
    Freshwater diatom Licmorpha sp. — Stock Photo
    Freshwater diatom Licmorpha sp.
    Miliary tuberculosis disease in lungs, digital illustration and light micrograph. — Stock Photo
    Miliary tuberculosis disease in lungs, digital illustration and light micrograph.
    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 — Stock Photo
    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
    Colored digital illustration of parasitic dust mites. — Stock Photo
    Colored digital illustration of parasitic dust mites.
    Human tooth fractured enamel, coloured scanning electron micrograph (SEM). — Stock Photo
    Human tooth fractured enamel, coloured scanning electron micrograph (SEM).
    Coloured scanning electron micrograph (SEM) of the shell (test) of a Globigerina sp. planktonic foraminiferan. — Stock Photo
    Coloured scanning electron micrograph (SEM) of the shell (test) of a Globigerina sp. planktonic foraminiferan.
    Cells undergoing mitosis — Stock Photo
    Cells undergoing mitosis
    Light micrograph of rectal papilloma on white background, — Stock Photo
    Light micrograph of rectal papilloma on white background,
    Light micrograph of red blood cells (erythrocytes, red) in a blood vessel. — Stock Photo
    Light micrograph of red blood cells (erythrocytes, red) in a blood vessel.
    Sporangium fungal cell with spores — Stock Photo
    Sporangium fungal cell with spores
    Osteoblasts. Colored transmission electron micrograph (TEM) of osteoblasts, bone-producing cells (purple and pink). They contain rough endoplasmic reticulum (RER), which produces, modifies and transports proteins, and nucleus — Stock Photo
    Osteoblasts. Colored transmission electron micrograph (TEM) of osteoblasts, bone-producing cells (purple and pink). They contain rough endoplasmic reticulum (RER), which produces, modifies and transports proteins, and nucleus
    Stomach surface epithelium, light micrograph (LM). The surface epithelium of the stomach is a simple columnar epithelium formed by tall mucous cells that invaginate to form the gastric pits — Stock Photo
    Stomach surface epithelium, light micrograph (LM). The surface epithelium of the stomach is a simple columnar epithelium formed by tall mucous cells that invaginate to form the gastric pits
    Mobile phone speaker, colored scanning electron micrograph. — Stock Photo
    Mobile phone speaker, colored scanning electron micrograph.
    Longitudinal section through smooth muscle — Stock Photo
    Longitudinal section through smooth muscle
    Red blood cells — Stock Photo
    Red blood cells
    Odontoblasts and the dental pulp — Stock Photo
    Odontoblasts and the dental pulp
    Coloured scanning electron micrograph (SEM) of a tardigrade (Macrobiotus sp.), or water bear. — Stock Photo
    Coloured scanning electron micrograph (SEM) of a tardigrade (Macrobiotus sp.), or water bear.
    Pancreatic cells. Colored transmission electron micrograph (TEM) of acinar (exocrine) pancreatic cells (red) adjacent to hormone- secreting (endocrine) Islet of Langerhans cells (yellow) — Stock Photo
    Pancreatic cells. Colored transmission electron micrograph (TEM) of acinar (exocrine) pancreatic cells (red) adjacent to hormone- secreting (endocrine) Islet of Langerhans cells (yellow)
    Skin cancer cell — Stock Photo
    Skin cancer cell
    Duct lined with pseudostratified epithelium — Stock Photo
    Duct lined with pseudostratified epithelium
    Scanning electron micrograph of bacterial culture from sputum. — Stock Photo
    Scanning electron micrograph of bacterial culture from sputum.
    Coloured scanning electron micrograph of dividing Schizosaccharomyces pombe yeast cells. — Stock Photo
    Coloured scanning electron micrograph of dividing Schizosaccharomyces pombe yeast cells.
    Section through a Pacinian corpuscle — Stock Photo
    Section through a Pacinian corpuscle
    Section through a wart — Stock Photo
    Section through a wart
    Seminiferous tubules and lending cells — Stock Photo
    Seminiferous tubules and lending cells
    Lily stem. Light micrograph(LM) of section through part of lily (Lilium) stem. Thin outer epidermis surrounds layer of cortex. At center is pith, which contains numerous vascular bundles (yellow) — Stock Photo
    Lily stem. Light micrograph(LM) of section through part of lily (Lilium) stem. Thin outer epidermis surrounds layer of cortex. At center is pith, which contains numerous vascular bundles (yellow)
    Dust mite, light micrograph — Stock Photo
    Dust mite, light micrograph
    Dense connective tissue, coloured scanning electron micrograph (SEM). — Stock Photo
    Dense connective tissue, coloured scanning electron micrograph (SEM).
    Taste buds. Coloured light micrograph of a section through the tongue, showing taste buds (round, purple). The taste buds are within papillae (projections) located on the surface of the tongue — Stock Photo
    Taste buds. Coloured light micrograph of a section through the tongue, showing taste buds (round, purple). The taste buds are within papillae (projections) located on the surface of the tongue
    Microvilli from the small intestine — Stock Photo
    Microvilli from the small intestine
    Tendon showing bundles of collagen fibres — Stock Photo
    Tendon showing bundles of collagen fibres
    Diatoms single-celled algae — Stock Photo
    Diatoms single-celled algae
    Cashmere wool fibres, coloured scanning electron micrograph (SEM). — Stock Photo
    Cashmere wool fibres, coloured scanning electron micrograph (SEM).
    Finger-like projections of the duodenum — Stock Photo
    Finger-like projections of the duodenum
    Chlamydia bacteria, illustration — Stock Photo
    Chlamydia bacteria, illustration