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Inclusions of the Ct-1943-3.1 (glycogen-negative) and Ct-1943-3N (glycogen-positive) C. trachomatis strains in McCoy cells stained with iodine. Arrows indicate the inclusions in strain Ct-1943-3.1; these inclusions are distinct from the normally stained inclusions of strain Ct-1943-3N in terms of stainability and morphology.
