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    Geranium pollen grain — Stock Photo
    Geranium pollen grain
    Passion flower pollen — Stock Photo
    Passion flower pollen
    Scanning electron micrograph (SEM) of a copepod (subclass Copepoda). — Stock Photo
    Scanning electron micrograph (SEM) of a copepod (subclass Copepoda).
    Colored scanning electron micrograph of stem cell-derived motor neuron cell. — Stock Photo
    Colored scanning electron micrograph of stem cell-derived motor neuron cell.
    Pancreas tissue. Transmission electron micrograph (TEM) of part of the exocrine pancreas. Seen here are zymogen granules and cell nuclei. In the image the endoplasmic reticulum that fills the cytoplasm is clearly visible. — Stock Photo
    Pancreas tissue. Transmission electron micrograph (TEM) of part of the exocrine pancreas. Seen here are zymogen granules and cell nuclei. In the image the endoplasmic reticulum that fills the cytoplasm is clearly visible.
    Scanning electron micrograph of Brevibacteria on human feet causing odour. — Stock Photo
    Scanning electron micrograph of Brevibacteria on human feet causing odour.
    Plaque-forming bacteria — Stock Photo
    Plaque-forming bacteria
    Diatom eukaryotic algae — Stock Photo
    Diatom eukaryotic algae
    Colored digital illustration of parasitic dust mites. — Stock Photo
    Colored digital illustration of parasitic dust mites.
    Asparagus pollen grains — Stock Photo
    Asparagus pollen grains
    Clothes moth wing scales — Stock Photo
    Clothes moth wing scales
    Campylobacter jejuni bacteria — Stock Photo
    Campylobacter jejuni bacteria
    Male sex cell — Stock Photo
    Male sex cell
    Enterococcus coccoid bacteria, colored scanning electron micrograph. — Stock Photo
    Enterococcus coccoid bacteria, colored scanning electron micrograph.
    Photosynthetic Navicula sp. diatom — Stock Photo
    Photosynthetic Navicula sp. diatom
    Dense connective tissue, coloured scanning electron micrograph (SEM). — Stock Photo
    Dense connective tissue, coloured scanning electron micrograph (SEM).
    Coloured scanning electron micrograph of cancer cells migrating down pores. — Stock Photo
    Coloured scanning electron micrograph of cancer cells migrating down pores.
    Colored scanning electron micrograph of osteosarcoma bone cancer cell. — Stock Photo
    Colored scanning electron micrograph of osteosarcoma bone cancer cell.
    Composite image of nasal epithelium and pollen. Coloured Scanning Electron Micrograph (SEM) of the surface of nasal epithelium with inhaled in pollen. — Stock Photo
    Composite image of nasal epithelium and pollen. Coloured Scanning Electron Micrograph (SEM) of the surface of nasal epithelium with inhaled in pollen.
    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) — Stock Photo
    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)
    Red and white blood cells aggregating — Stock Photo
    Red and white blood cells aggregating
    Pollen threads and brochosomes — Stock Photo
    Pollen threads and brochosomes
    Colored digital illustration of parasitic dust mites. — Stock Photo
    Colored digital illustration of parasitic dust mites.
    Allergenic pet dander on dog hair, colored scanning electron micrograph. — Stock Photo
    Allergenic pet dander on dog hair, colored scanning electron micrograph.
    Pollen threads and brochosomes — Stock Photo
    Pollen threads and brochosomes
    Colored scanning electron micrograph of diatoms photosynthetic single-celled algae. — Stock Photo
    Colored scanning electron micrograph of diatoms photosynthetic single-celled algae.
    Freshwater diatom Licmorpha sp. — Stock Photo
    Freshwater diatom Licmorpha sp.
    Blood vessel in the lung — Stock Photo
    Blood vessel in the lung
    Dividing prostate cancer cells, coloured scanning electron micrograph. — Stock Photo
    Dividing prostate cancer cells, coloured scanning electron micrograph.
    Puffball fungus spore — Stock Photo
    Puffball fungus spore
    Plaque-forming bacteria — Stock Photo
    Plaque-forming bacteria
    Lychnocanoma radiolarian shell — Stock Photo
    Lychnocanoma radiolarian shell
    Schizosaccharomyces pombe yeast — Stock Photo
    Schizosaccharomyces pombe yeast
    Caterpillar hairs. Coloured scanning electron micrograph (SEM) of hairs from the vapourer moth (Orgyia antiqua) caterpillar. — Stock Photo
    Caterpillar hairs. Coloured scanning electron micrograph (SEM) of hairs from the vapourer moth (Orgyia antiqua) caterpillar.
    Pollen grains of a common daisy — Stock Photo
    Pollen grains of a common daisy
    Staphylococcus aureus coccoid bacteria, colored scanning electron micrograph. — Stock Photo
    Staphylococcus aureus coccoid bacteria, colored scanning electron micrograph.
    Human hair Caucasian brunette, coloured scanning electron micrograph. — Stock Photo
    Human hair Caucasian brunette, coloured scanning electron micrograph.
    Weevil (Sitophilus sp.), coloured scanning electron micrograph (SEM). This weevil is a major agricultural pest. It primarily attacks stored grains and fruits, feeding on them with its often elongated snout, or rostrum — Stock Photo
    Weevil (Sitophilus sp.), coloured scanning electron micrograph (SEM). This weevil is a major agricultural pest. It primarily attacks stored grains and fruits, feeding on them with its often elongated snout, or rostrum
    Human blood cells — Stock Photo
    Human blood cells
    Shell of a radiolarian — Stock Photo
    Shell of a radiolarian
    Freshwater single diatom — Stock Photo
    Freshwater single diatom
    Colored digital illustration of parasitic dust mites. — Stock Photo
    Colored digital illustration of parasitic dust mites.
    Green colored dust mite, digital illustration. — Stock Photo
    Green colored dust mite, digital illustration.
    Human blood cells — Stock Photo
    Human blood cells
    Colored scanning electron micrograph of red blood cells. — Stock Photo
    Colored scanning electron micrograph of red blood cells.
    Blood clot or thrombus — Stock Photo
    Blood clot or thrombus
    Fibrosarcoma cells in late stage of mitosis — Stock Photo
    Fibrosarcoma cells in late stage of mitosis
    Radiolarians amoeboid protozoa — Stock Photo
    Radiolarians amoeboid protozoa
    Sperm in a fallopian tube. Coloured composition scanning electron micrograph (SEM) of human sperm travelling through a fallopian tube (oviduct) of a female — Stock Photo
    Sperm in a fallopian tube. Coloured composition scanning electron micrograph (SEM) of human sperm travelling through a fallopian tube (oviduct) of a female
    Dog hair, coloured scanning electron micrograph (SEM). — Stock Photo
    Dog hair, coloured scanning electron micrograph (SEM).
    Scanning electron micrograph of PC12 neurone in culture. — Stock Photo
    Scanning electron micrograph of PC12 neurone in culture.
    Colored scanning electron micrograph of coccoliths calcium carbonate plates from coccolithophore algal organisms. — Stock Photo
    Colored scanning electron micrograph of coccoliths calcium carbonate plates from coccolithophore algal organisms.
    Coloured scanning electron micrograph (SEM) of a squamous cell on the surface of the skin. — Stock Photo
    Coloured scanning electron micrograph (SEM) of a squamous cell on the surface of the skin.
    Campylobacter jejuni bacteria — Stock Photo
    Campylobacter jejuni bacteria
    Colored digital illustration of parasitic dust mites. — Stock Photo
    Colored digital illustration of parasitic dust mites.
    Sporangium fungal cell with spores — Stock Photo
    Sporangium fungal cell with spores
    Coloured scanning electron micrograph of 293T cell in early stage of programmed apoptosis cell death. — Stock Photo
    Coloured scanning electron micrograph of 293T cell in early stage of programmed apoptosis cell death.
    Colored scanning electron micrograph of resting T-lymphocytes from human blood sample. — Stock Photo
    Colored scanning electron micrograph of resting T-lymphocytes from human blood sample.
    Silica wall of a diatom — Stock Photo
    Silica wall of a diatom
    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