Gram staining divides bacterial species into roughly two equal groups.

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Gram staining categorizes bacteria into two major types based on the characteristics of their cell walls. These two types are Gram-positive bacteria, which appear purple or blue under the microscope, and Gram-negative bacteria, which appear pink or red. The technique is not perfect and some bacteria may not fall easily within either category, but it is a generally useful and widely-used method of bacterial differentiation.

Gram Staining Divides Bacterial Species into Roughly Two Equal Groups