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    Macrophage. Coloured transmission electron micrograph (TEM) of a macrophage cell. The cell's nucleus is red. Mitochondria (orange) in the cell's cytoplasm produce energy for the cell. Lysosomes (black) contain enzymes for digesting foreign particles. — Stock Photo
    Macrophage. Coloured transmission electron micrograph (TEM) of a macrophage cell. The cell's nucleus is red. Mitochondria (orange) in the cell's cytoplasm produce energy for the cell. Lysosomes (black) contain enzymes for digesting foreign particles.
    Transplacental transmission of Toxoplasma gondii parasites to human embryo, conceptual illustration. — Stock Photo
    Transplacental transmission of Toxoplasma gondii parasites to human embryo, conceptual illustration.
    Pilot operating airplane in cockpit — Stock Photo
    Pilot operating airplane in cockpit
    Malaria-infected mosquito piercing skin and transmitting malaria parasites into bloodstream. — Stock Photo
    Malaria-infected mosquito piercing skin and transmitting malaria parasites into bloodstream.
    Power line with industrial chimney — Stock Photo
    Power line with industrial chimney
    Woman using automatic vending machine at railway station — Stock Photo
    Woman using automatic vending machine at railway station
    Colourful buildings on a hillside; Nuuk, Sermersooq, Greenland — Stock Photo
    Colourful buildings on a hillside; Nuuk, Sermersooq, Greenland
    Grandmother and little boy kneading dough at kitchen — Stock Photo
    Grandmother and little boy kneading dough at kitchen
    Abstract structure of neural network on dark background, digital illustration. — Stock Photo
    Abstract structure of neural network on dark background, digital illustration.
    Coloured scanning electron micrograph of osteocyte bone cell surrounded by bone tissue. — Stock Photo
    Coloured scanning electron micrograph of osteocyte bone cell surrounded by bone tissue.
    Vintage old car parked at urban street — Stock Photo
    Vintage old car parked at urban street
    Prevention of transplacental HIV transmission to human embryo from infected mother, conceptual illustration. — Stock Photo
    Prevention of transplacental HIV transmission to human embryo from infected mother, conceptual illustration.
    Digital illustration of pyramidal nerve cells from cerebral cortex of brain. — Stock Photo
    Digital illustration of pyramidal nerve cells from cerebral cortex of brain.
    Man wearing a mask and gloves standing on a path outside using his smart phone during the Covid-19 world pandemic; Edmonton, Alberta, Canada — Stock Photo
    Man wearing a mask and gloves standing on a path outside using his smart phone during the Covid-19 world pandemic; Edmonton, Alberta, Canada
    Aerial image of high voltage poles at a glacier river in Iceland — Stock Photo
    Aerial image of high voltage poles at a glacier river in Iceland
    Seminiferous tubules and lending cells — Stock Photo
    Seminiferous tubules and lending cells
    Chlamydia bacteria, illustration — Stock Photo
    Chlamydia bacteria, illustration
    Carcinoma cell, coloured transmission electron micrograph (TEM). — Stock Photo
    Carcinoma cell, coloured transmission electron micrograph (TEM).
    Intestinal microvilli. Coloured transmission electron micrograph (TEM) of a section through microvilli from the small intestine. These tiny structures (cyan) form a dense brush-like covering on the absorptive surfaces of the cells — Stock Photo
    Intestinal microvilli. Coloured transmission electron micrograph (TEM) of a section through microvilli from the small intestine. These tiny structures (cyan) form a dense brush-like covering on the absorptive surfaces of the cells
    Power pylon on country plains under clouds in Texas, USA — Stock Photo
    Power pylon on country plains under clouds in Texas, USA
    Grey metal tower, industrial building — Stock Photo
    Grey metal tower, industrial building
    Bacteria Erysipelothrix rhusiopathiae — Stock Photo
    Bacteria Erysipelothrix rhusiopathiae
    Transportation infrastructure with flyovers at motorway interchange in West Bromwich, West Midlands, UK. — Stock Photo
    Transportation infrastructure with flyovers at motorway interchange in West Bromwich, West Midlands, UK.
    Wooden pylons supporting powerlines across sand dunes in United Arab Emirates. — Stock Photo
    Wooden pylons supporting powerlines across sand dunes in United Arab Emirates.
    Transplacental transmission of HIV infecting 8 week human embryo, conceptual computer illustration. — Stock Photo
    Transplacental transmission of HIV infecting 8 week human embryo, conceptual computer illustration.
    Old man working in pandemic quarantine — Stock Photo
    Old man working in pandemic quarantine
    Malaria-infected mosquito piercing skin and transmitting malaria parasites into bloodstream. — Stock Photo
    Malaria-infected mosquito piercing skin and transmitting malaria parasites into bloodstream.
    Bottom view of black wires and high voltage power pole on background of dark cloudy sky. — Stock Photo
    Bottom view of black wires and high voltage power pole on background of dark cloudy sky.
    Lung tissue, coloured transmission electron micrograph (TEM). — Stock Photo
    Lung tissue, coloured transmission electron micrograph (TEM).
    Varicella zoster virus particle — Stock Photo
    Varicella zoster virus particle
    Abstract structure of neural network on dark background, digital illustration. — Stock Photo
    Abstract structure of neural network on dark background, digital illustration.
    Human embryo and close-up of Toxoplasma gondii parasites, conceptual illustration. — Stock Photo
    Human embryo and close-up of Toxoplasma gondii parasites, conceptual illustration.
    Men wearing masks and gloves walking on a path by the Legislature during the Covid-19 world pandemic; Edmonton, Alberta, Canada — Stock Photo
    Men wearing masks and gloves walking on a path by the Legislature during the Covid-19 world pandemic; Edmonton, Alberta, Canada
    Young girl standing wearing a protective mask to protect against COVID-19 during the Coronavirus World Pandemic; Toronto, Ontario, Canada — Stock Photo
    Young girl standing wearing a protective mask to protect against COVID-19 during the Coronavirus World Pandemic; Toronto, Ontario, Canada
    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 — Stock Photo
    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
    Vaccinia virus particle — Stock Photo
    Vaccinia virus particle
    Nerve cell, computer illustration — Stock Photo
    Nerve cell, computer illustration
    Boy embracing smiling senior man, looking at camera — Stock Photo
    Boy embracing smiling senior man, looking at camera
    Power transmission towers at dusk near Winnipeg, Manitoba, Canada. — Stock Photo
    Power transmission towers at dusk near Winnipeg, Manitoba, Canada.
    Windows boarded up on a building during national lockdown in London during the Covid-19 Global Pandemic; London, England — Stock Photo
    Windows boarded up on a building during national lockdown in London during the Covid-19 Global Pandemic; London, England
    Zika virus particles — Stock Photo
    Zika virus particles
    Helicobacter pylori bacterium — Stock Photo
    Helicobacter pylori bacterium
    Serious gray haired elderly repairman using tablet and watching video instruction while fixing old broken motorcycle in garage — Stock Photo
    Serious gray haired elderly repairman using tablet and watching video instruction while fixing old broken motorcycle in garage
    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)
    Clouds over satellite dishes, South Boston, Suffolk County, Massachusetts, USA — Stock Photo
    Clouds over satellite dishes, South Boston, Suffolk County, Massachusetts, USA
    Prevention of transplacental HIV transmission to human embryo from infected mother, conceptual illustration. — Stock Photo
    Prevention of transplacental HIV transmission to human embryo from infected mother, conceptual illustration.
    Two Transmission Towers — Stock Photo
    Two Transmission Towers
    Flowering canola field with a pipeline in the field with blue sky; Beiseker, Alberta, Canada — Stock Photo
    Flowering canola field with a pipeline in the field with blue sky; Beiseker, Alberta, Canada
    COVID-19. Syringe, protective mask and disinfectant gel, latex gloves. Products to prevent coronavirus. on white background Isolated.Quarantine — Stock Photo
    COVID-19. Syringe, protective mask and disinfectant gel, latex gloves. Products to prevent coronavirus. on white background Isolated.Quarantine
    High voltage tower, electricity pylon, blue sky — Stock Photo
    High voltage tower, electricity pylon, blue sky
    From below big red telecommunication tower on background of cloudy sky. — Stock Photo
    From below big red telecommunication tower on background of cloudy sky.
    Neisseria gonorrhoeae bacterium — Stock Photo
    Neisseria gonorrhoeae bacterium
    Two friends looking at a wine glass — Stock Photo
    Two friends looking at a wine glass
    Digital illustration of pyramidal nerve cells from cerebral cortex of brain. — Stock Photo
    Digital illustration of pyramidal nerve cells from cerebral cortex of brain.
    Striated muscle. Coloured transmission electron micrograph (TEM) of a longitudinal section through striated skeletal muscle. The striated banding-pattern of the muscle fibrils is seen — Stock Photo
    Striated muscle. Coloured transmission electron micrograph (TEM) of a longitudinal section through striated skeletal muscle. The striated banding-pattern of the muscle fibrils is seen
    Influenza viruses and host cell — Stock Photo
    Influenza viruses and host cell
    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. — Stock Photo
    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.
    Electrical-Power Transmission Lines — Stock Photo
    Electrical-Power Transmission Lines
    Cobblestone lane in Soho at evening rush hour during the national lockdown for the Covid-19 pandemic; London, England, UK — Stock Photo
    Cobblestone lane in Soho at evening rush hour during the national lockdown for the Covid-19 pandemic; London, England, UK
    Sunrise On Highway with car — Stock Photo
    Sunrise On Highway with car