Bacterial colonies cultured on blood agar growth medium in a petri dish. Blood agar is a mixture of nutrient agar gel with mammalian blood cells. It i

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Bacterial colonies cultured on blood agar growth medium in a petri dish. Blood agar is a mixture of nutrient agar gel with mammalian blood cells. It is widely used for growing bacterial colonies.

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Photo credit: © R.A. LONGUEHAYE/SCIENCE PHOTO LIBRARY / Alamy / Afripics
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