smiling doctor working modern laboratory research scientist examines substance under microscope |
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| navigate by keyword : microorganism microbiology contented working medical chemistry petridish involved man darkhaired research indoors examine biology scientist modification testing transparent experimental occupation bearded laboratory virology eyeglasses success doctor biotechnology analyze smile sterile dna microscope science investigation |
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| Smiling doctor working in modern laboratory research scientist examines substance under microscope, adjusts specimen in petri dish. |
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