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    Single test tube with blood sample. — Stock Photo
    Single test tube with blood sample.
    Multichannel pipette pipetting into rack of tubes. — Stock Photo
    Multichannel pipette pipetting into rack of tubes.
    Micropipette pipetting blood sample into Petri dish. — Stock Photo
    Micropipette pipetting blood sample into Petri dish.
    Micropipette pipetting blood sample into Petri dish. — Stock Photo
    Micropipette pipetting blood sample into Petri dish.
    Microbiological culture growing in Petri dish, close-up. — Stock Photo
    Microbiological culture growing in Petri dish, close-up.
    Pattern of cultures growing in Petri dishes on plain background. — Stock Photo
    Pattern of cultures growing in Petri dishes on plain background.
    Female scientist examining DNA autoradiogram. — Stock Photo
    Female scientist examining DNA autoradiogram.
    Petri dishes with blood samples on plain background. — Stock Photo
    Petri dishes with blood samples on plain background.
    Microbiological culture growing in Petri dish. — Stock Photo
    Microbiological culture growing in Petri dish.
    Molecular model of parathyroid hormone structure. — Stock Photo
    Molecular model of parathyroid hormone structure.
    Close-up of micropipette pipetting blood sample into microcentrifuge tubes. — Stock Photo
    Close-up of micropipette pipetting blood sample into microcentrifuge tubes.
    Close-up of scientist fingers holding microcentrifuge tube with blue liquid. — Stock Photo
    Close-up of scientist fingers holding microcentrifuge tube with blue liquid.
    Racks of samples in test tubes and Petri dishes on laboratory table. — Stock Photo
    Racks of samples in test tubes and Petri dishes on laboratory table.
    Blood samples for testing in microcentrifuge tubes. — Stock Photo
    Blood samples for testing in microcentrifuge tubes.
    Microcentrifuge sample tubes in styrofoam rack on blue background. — Stock Photo
    Microcentrifuge sample tubes in styrofoam rack on blue background.
    Tubes for biological test in rack on blue background. — Stock Photo
    Tubes for biological test in rack on blue background.
    Pipette placing sample into test tube during experiment in laboratory. — Stock Photo
    Pipette placing sample into test tube during experiment in laboratory.
    Pipette adding sample to petri dish with DNA autoradiogram in background. — Stock Photo
    Pipette adding sample to petri dish with DNA autoradiogram in background.
    Pattern of cultures growing in Petri dishes on plain background. — Stock Photo
    Pattern of cultures growing in Petri dishes on plain background.
    Molecular model of metalloproteinase snake venom from diamondback rattlesnake. — Stock Photo
    Molecular model of metalloproteinase snake venom from diamondback rattlesnake.
    Molecular model of parathyroid hormone structure. — Stock Photo
    Molecular model of parathyroid hormone structure.
    Activated Ras protein, digital illustration. — Stock Photo
    Activated Ras protein, digital illustration.
    Close-up of hand using multipipette for placing DNA onto agarose gel. — Stock Photo
    Close-up of hand using multipipette for placing DNA onto agarose gel.
    Rack of test tubes with blood samples on blue background. — Stock Photo
    Rack of test tubes with blood samples on blue background.
    Activation of Ras proteins, digital illustration. — Stock Photo
    Activation of Ras proteins, digital illustration.
    Rack of test tubes with blood samples on blue background. — Stock Photo
    Rack of test tubes with blood samples on blue background.
    Rack of test tubes with blood samples in laboratory. — Stock Photo
    Rack of test tubes with blood samples in laboratory.
    Molecular model of phosphodiesterase snake venom from Taiwan cobra. — Stock Photo
    Molecular model of phosphodiesterase snake venom from Taiwan cobra.
    Digital model of molecules of growth hormone somatotropin. — Stock Photo
    Digital model of molecules of growth hormone somatotropin.
    Tubes for biological test in rack on blue background. — Stock Photo
    Tubes for biological test in rack on blue background.
    Molecular structure illustrating pure research. — Stock Photo
    Molecular structure illustrating pure research.
    Female scientist examining DNA autoradiogram. — Stock Photo
    Female scientist examining DNA autoradiogram.
    Molecular model of follicle-stimulating hormone. — Stock Photo
    Molecular model of follicle-stimulating hormone.
    Pipette adding sample to petri dish during experiment in laboratory. — Stock Photo
    Pipette adding sample to petri dish during experiment in laboratory.
    Lysozyme molecular structure, digital illustration. — Stock Photo
    Lysozyme molecular structure, digital illustration.
    Pipette adding sample to petri dish with DNA autoradiogram in background. — Stock Photo
    Pipette adding sample to petri dish with DNA autoradiogram in background.
    Pipette placing sample into test tube during experiment in laboratory. — Stock Photo
    Pipette placing sample into test tube during experiment in laboratory.
    Molecular model of snake venom toxin convulxin from tropical rattlesnake. — Stock Photo
    Molecular model of snake venom toxin convulxin from tropical rattlesnake.
    Molecular model of follicle-stimulating hormone. — Stock Photo
    Molecular model of follicle-stimulating hormone.
    Close-up of DNA autoradiogram on white background. — Stock Photo
    Close-up of DNA autoradiogram on white background.
    Molecular model of phosphodiesterase snake venom from Taiwan cobra. — Stock Photo
    Molecular model of phosphodiesterase snake venom from Taiwan cobra.
    Molecular structure illustrating pure research. — Stock Photo
    Molecular structure illustrating pure research.
    Lysozyme molecular structure, digital illustration. — Stock Photo
    Lysozyme molecular structure, digital illustration.
    Molecular model of metalloproteinase snake venom from diamondback rattlesnake. — Stock Photo
    Molecular model of metalloproteinase snake venom from diamondback rattlesnake.
    Activation of Ras proteins, digital illustration. — Stock Photo
    Activation of Ras proteins, digital illustration.
    Activation of Ras proteins, digital illustration. — Stock Photo
    Activation of Ras proteins, digital illustration.
    Scientist holding multi-well plate with growth medium. — Stock Photo
    Scientist holding multi-well plate with growth medium.
    Close-up of DNA autoradiograms on white background. — Stock Photo
    Close-up of DNA autoradiograms on white background.
    Molecular structure illustrating pure research. — Stock Photo
    Molecular structure illustrating pure research.
    Close-up of DNA autoradiogram on white background. — Stock Photo
    Close-up of DNA autoradiogram on white background.
    Close-up of DNA autoradiogram on white background. — Stock Photo
    Close-up of DNA autoradiogram on white background.
    Molecular model of parathyroid hormone structure. — Stock Photo
    Molecular model of parathyroid hormone structure.
    Scientist holding multi-well plate with growth medium. — Stock Photo
    Scientist holding multi-well plate with growth medium.
    Molecular model of snake venom toxin convulxin from tropical rattlesnake. — Stock Photo
    Molecular model of snake venom toxin convulxin from tropical rattlesnake.
    Molecular model of follicle-stimulating hormone. — Stock Photo
    Molecular model of follicle-stimulating hormone.
    Close-up of DNA autoradiogram on white background. — Stock Photo
    Close-up of DNA autoradiogram on white background.
    Pipette adding sample to petri dish with DNA autoradiogram in background. — Stock Photo
    Pipette adding sample to petri dish with DNA autoradiogram in background.
    Close-up of DNA autoradiogram on white background. — Stock Photo
    Close-up of DNA autoradiogram on white background.
    Pipette adding sample to petri dish with DNA autoradiogram in background. — Stock Photo
    Pipette adding sample to petri dish with DNA autoradiogram in background.
    Lysozyme molecular structure, digital illustration. — Stock Photo
    Lysozyme molecular structure, digital illustration.