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    Woman undergoing ophthalmology visual field testing with A-scan ultrasound biometry. — Stock Photo
    Woman undergoing ophthalmology visual field testing with A-scan ultrasound biometry.
    Senior woman using spirometer, measuring lung capacity and peak expiratory force. — Stock Photo
    Senior woman using spirometer, measuring lung capacity and peak expiratory force.
    From above pregnant female inspecting sonogram picture while sitting in a chair in ward of modern fertility clinic — Stock Photo
    From above pregnant female inspecting sonogram picture while sitting in a chair in ward of modern fertility clinic
    Glass phial with blood sample. — Stock Photo
    Glass phial with blood sample.
    Team of scientists experimenting together in laboratory — Stock Photo
    Team of scientists experimenting together in laboratory
    Close-up of male scientist experimenting in laboratory — Stock Photo
    Close-up of male scientist experimenting in laboratory
    Adult employee checking food quality in canteen — Stock Photo
    Adult employee checking food quality in canteen
    Group of laboratory test tubes with colored liquids. — Stock Photo
    Group of laboratory test tubes with colored liquids.
    Scientist pipetting solution into the glass test tube at lab — Stock Photo
    Scientist pipetting solution into the glass test tube at lab
    Female medical specialist in protective uniform, latex gloves and face mask doing nasal coronavirus test on African American mature woman patient in clinic during virus outbreak — Stock Photo
    Female medical specialist in protective uniform, latex gloves and face mask doing nasal coronavirus test on African American mature woman patient in clinic during virus outbreak
    Measuring oxygen levels in blood with pulse oximeter. — Stock Photo
    Measuring oxygen levels in blood with pulse oximeter.
    Colleagues checking food quality in canteen — Stock Photo
    Colleagues checking food quality in canteen
    Urine sample with test strip showing results. — Stock Photo
    Urine sample with test strip showing results.
    Optician testing a girl's eyes with optometry devices — Stock Photo
    Optician testing a girl's eyes with optometry devices
    Plant biotechnology and research — Stock Photo
    Plant biotechnology and research
    Pipette dripping liquid into test tubes. — Stock Photo
    Pipette dripping liquid into test tubes.
    Nurse holding pregnancy urinalysis test results. — Stock Photo
    Nurse holding pregnancy urinalysis test results.
    Hospital radiologist sitting at desk in front of CT scans. — Stock Photo
    Hospital radiologist sitting at desk in front of CT scans.
    A garage or auto repair shop air pressure valve with compressor machine — Stock Photo
    A garage or auto repair shop air pressure valve with compressor machine
    Crop anonymous scientist in disposable gloves with liquid in small transparent bottle working in laboratory — Stock Photo
    Crop anonymous scientist in disposable gloves with liquid in small transparent bottle working in laboratory
    Researcher preparing samples of donated blood for analysis. — Stock Photo
    Researcher preparing samples of donated blood for analysis.
    Doctor adjusting electroencephalography equipment on mature patient. — Stock Photo
    Doctor adjusting electroencephalography equipment on mature patient.
    Genetic research, conceptual illustration. DNA (deoxyribonucleic acid) molecule in blood sample tubes in a centrifuge. — Stock Photo
    Genetic research, conceptual illustration. DNA (deoxyribonucleic acid) molecule in blood sample tubes in a centrifuge.
    Female medical specialist in protective uniform, latex gloves and face mask doing nasal swab test with cotton bud on African American female patient in clinic during coronavirus outbreak — Stock Photo
    Female medical specialist in protective uniform, latex gloves and face mask doing nasal swab test with cotton bud on African American female patient in clinic during coronavirus outbreak
    Scientist pouring liquid in steaming flask — Stock Photo
    Scientist pouring liquid in steaming flask
    Coffee beans in test tube on white background, studio shot. — Stock Photo
    Coffee beans in test tube on white background, studio shot.
    Female scientist pouring dissolved soil sample into chemistry beaker. — Stock Photo
    Female scientist pouring dissolved soil sample into chemistry beaker.
    Close-up of scientist pipetting sample into eppendorf tube during experiment in laboratory. — Stock Photo
    Close-up of scientist pipetting sample into eppendorf tube during experiment in laboratory.
    School in Grashoek village — Stock Photo
    School in Grashoek village
    Serious male college student taking test at desk in classroom — Stock Photo
    Serious male college student taking test at desk in classroom
    Laboratory technicians working together in blood bank — Stock Photo
    Laboratory technicians working together in blood bank
    Blood sample and syringe on table. — Stock Photo
    Blood sample and syringe on table.
    Female scientist holding micro tube with sample in ancient DNA laboratory. — Stock Photo
    Female scientist holding micro tube with sample in ancient DNA laboratory.
    Elderly bearded male in headphones sitting in soundproof room during audiology examination and hearing test — Stock Photo
    Elderly bearded male in headphones sitting in soundproof room during audiology examination and hearing test
    Tube with blood sample on metal tray in laboratory. — Stock Photo
    Tube with blood sample on metal tray in laboratory.
    Radiologist recording results of CT scanning. — Stock Photo
    Radiologist recording results of CT scanning.
    Female doctor performing skin prick allergy testing on boy for possible allergen. — Stock Photo
    Female doctor performing skin prick allergy testing on boy for possible allergen.
    Chinese doctor showing x-ray test result to senior couple — Stock Photo
    Chinese doctor showing x-ray test result to senior couple
    Close-up of pipetting samples into Petri dishes. — Stock Photo
    Close-up of pipetting samples into Petri dishes.
    African boy with protective mask to avoid covid19 — Stock Photo
    African boy with protective mask to avoid covid19
    Senior woman doing a mailed DNA test at home. — Stock Photo
    Senior woman doing a mailed DNA test at home.
    Biologist with protective gloves performing a coronavirus test on a person in a car — Stock Photo
    Biologist with protective gloves performing a coronavirus test on a person in a car
    Close-up view of tweezers holding dna autoradiogram. — Stock Photo
    Close-up view of tweezers holding dna autoradiogram.
    Preteen boy undergoing lung function test with female nurse. — Stock Photo
    Preteen boy undergoing lung function test with female nurse.
    Scientific laboratory researcher using test tube and microscope. — Stock Photo
    Scientific laboratory researcher using test tube and microscope.
    Female doctor preparing to do a pcr test — Stock Photo
    Female doctor preparing to do a pcr test
    Scientists preparing blood sample for analysis under light microscope. — Stock Photo
    Scientists preparing blood sample for analysis under light microscope.
    Close-up of optometrist examining patient eyes with autorefractors in clinic — Stock Photo
    Close-up of optometrist examining patient eyes with autorefractors in clinic
    Dentist filling a patient's tooth — Stock Photo
    Dentist filling a patient's tooth
    Girl student examining pink liquid, conducting scientific experiment in laboratory classroom — Stock Photo
    Girl student examining pink liquid, conducting scientific experiment in laboratory classroom
    Closeup view of shellfish soup with scampi in test tubes — Stock Photo
    Closeup view of shellfish soup with scampi in test tubes
    Forensic DNA autoradiogram — Stock Photo
    Forensic DNA autoradiogram
    Urine sample in container for analysis, studio shot. — Stock Photo
    Urine sample in container for analysis, studio shot.
    Closeup of anonymous female patient using pulseoximeter to measure level of oxygen in blood while putting device on finger in room — Stock Photo
    Closeup of anonymous female patient using pulseoximeter to measure level of oxygen in blood while putting device on finger in room
    Group of laboratory test tubes. — Stock Photo
    Group of laboratory test tubes.
    Female doctor teaching diabetic patient how to use glucometer in doctors office — Stock Photo
    Female doctor teaching diabetic patient how to use glucometer in doctors office
    Tests on desks in empty classroom interior — Stock Photo
    Tests on desks in empty classroom interior
    Microbiologist taking bacterial sample on microscope slide. — Stock Photo
    Microbiologist taking bacterial sample on microscope slide.
    Scientist in clean suit researching coronavirus in laboratory — Stock Photo
    Scientist in clean suit researching coronavirus in laboratory
    Computer programmers testing virtual reality simulator glasses in office — Stock Photo
    Computer programmers testing virtual reality simulator glasses in office