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Created page with "== Introduction == The Gram stain is a method of staining bacterial cells that was first developed by the Danish bacteriologist Hans Christian Gram in 1884. This technique is one of the most important and widely used in the field of microbiology and is named after its inventor. The Gram stain allows for the differentiation of bacteria into two large groups: Gram-positive and Gram-negative. This differentiation is based on the che..."