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Cell types of T. vorax. (A) Microstomal cell type. (B) Macrostomal cell type. Differentiation involves the replacement of the small oral apparatus (OA) in the microstomal form with the large oral apparatus characteristic of the macrostomal cell type and development of the cytopharyngeal pouch (CP) in the place of small phagosomes (P). (Bar represents 10 μm.)
