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28.7 x 43.9 cm ⏐ 11.3 x 17.3 in (300dpi)
BRUCE FRITZ / US DEPARTMENT OF AGRICULTURE / SCIENCE PHOTO LIBRARY BRUCE FRITZ / US DEPARTMENT OF AGRICULTURE / SCIENCE PHOTO LIBRARY
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Testing for cattle tuberculosis. Technician loading an agar gel with Polymerase Chain Reaction (PCR) amplified DNA material from a thermocycler (foreground). PCR is a procedure commonly used in molecular biology that amplifies a sample of DNA to allow it to be sequenced. The sequence is then studied to determine what organism it came from. This will indicate within 3 days whether or not the culture contains Mycobacterium bovis, the bacteria that causes bovine tuberculosis.
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