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| | Gram staining - Wikipedia, the free encyclopedia |
 | | Gram staining is one of the most useful staining procedures in bacteriological laboratory. | | | This shortens the length of the procedure considerably, which is especially useful if staining a large amount of samples (which is often the case in a clinical laboratory). | | | Organisms that cannot reliably be differentiated by this staining technique are said to be Gram-variable. |
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http://en.wikipedia.org/wiki/Gram_stain
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