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Crop scientist's hand holding blood sample in test tube at laboratory
Test tubes and Erlenmeyer flask in laboratory
Blood sample in test tube in hand of scientist.
Scientist holding DNA sample in tube with autoradiograph on DNA gel.
Scientist testing samples in test tube.
DNA autoradiogram gel illustrating genetic results laying on a row of test tubes in the laboratory
Pipette adding sample to a test tube in a laboratory
Test tubes in a laboratory
Scientist placing test tube in refrigerator
Cropped image of female hand pipetting yellow liquid into test tubes in lab
Young researchers holding dropper and test tube in laboratory.
Scientist experimenting with liquid chemicals and test tube, cropped shot
Laboratory technician holding test tubes in blood bank
Scientist looking at test tubes in lab
Scientist checking a solution in test tube in lab
Scientist pipetting liquid in test tube
Scientist working in laboratory, Pipette and test tubes
Single test tube with blood sample in rack.
Cropped image of scientist holding sample in endorphin vial during experiment in laboratory
Scientist working in laboratory with test tube and pipette
Hand of Scientist holding test tube in lab
Analytical chemistry, sample being pipetted into a test tube for testing in laboratory
Scientist analyzing a sample in a test tube at lab
Female scientist holding blood sample by microscope in laboratory.
Laboratory technician in analytical laboratory taking test tubes from a centrifuge container
Female scientist holding test tube
Biologist in laboratory looking at test tube
Crop scientist hand holding test tube at table in laboratory
Close-up of scientist hand holding test tube with fluorescent chemical fluid.
Scientist pipetting liquid in test tube, cropped shot
Scientist preparing blood samples in a multi well plate for clinical testing in a laboratory
Single test tube with blood sample.
Young male and female researchers holding dropper and test tube in laboratory.
Scientist examining test tube with blue liquid
Cropped view of graduated pipette pipetting liquid into test tubes
Human hand pipetting blue liquid into test tubes
Laboratory technician placing test tube in machine at blood bank
Scientist holding test tube with green liquid
Scientist loading test tubes into small centrifuge
Female scientist holding tube with blood sample.
Chemist working in lab with test tube
Close-up of pipetting liquid into test tubes
Graduated pipette and test tubes
Person dropping blood sample into vial with pipette.
Scientist pipetting solution into the glass test tube at lab
Scientist pouring chemical solution on test tube from bottle in lab
Students in chemistry class pipetting liquid into test tube
Chemist looking at test tube in lab
Human hand pipetting pink liquid into test tubes
Student in chemistry class pipetting liquid into test tube
Three chemists working in a chemical laboratory, one with test tube, another using digital tablet
Close-up of scientist hand pouring reagent into flask for chemical research.
Medical worker gloved hands holding test stick in urine sample tube.
Closeup of female hand holding test tube in laboratory
Female scientist examining test tube in laboratory
Female scientist in laboratory examining test tube
Germany, Pipetting pink liquid into test tubes, close up
Close-up of pink liquid in test tube on table with laboratory glassware.
Laboratory technician preparing blood sample for medical testing in laboratory
Scientist working with pipette and test tube