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TEM of B. dermatitidis cells interacting with A. castellanii cells. (A) An apparently intact A. castellanii cell with pseudopodia interacting with a B. dermatitidis cell. (B) B. dermatitidis cells engaged with an amoeba manifest reduced cytoplasmic electron density and electron-dense mitochondria in amoeba cells at 24 h postinfection. Magnification, ×9,000 (A) and ×12,000 (B).
