Test tubes containing samples for analysis. They are sealed with rubber bungs to prevent them being contaminated. The bungs also allow syringes to be


Test tubes containing samples for analysis. They are sealed with rubber bungs to prevent them being contaminated. The bungs also allow syringes to be used to cleanly retrieve samples for analysis.


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Photo credit: © TEK IMAGE/SCIENCE PHOTO LIBRARY / Alamy / Afripics
License: Licensed
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