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Gram's stain
In microbiology, a differential staining method named after the Danish physician Hans Christian Gram (1853–1938). It aids in the categorizing and identification of bacteria, which are said to be Gram-positive or Gram-negative, depending on whether or not they retain the original violet stain at the end of the process. If Gram-negative, the stain washes out to a red counterstain.
Related category
• MICROBIOLOGY
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