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Transformation of dimorphic fungi from yeast forms to pseudohyphal or hyphal forms. (A) TEM (magnification, ×15,000) of a representative hyphal form from a 24-h coculture of B. dermatitidis (Bd) yeast with A. castellanii (Ac). Pseudohyphal (arrowhead) and hyphal forms (asterisk) were present in cocultures of H. capsulatum yeast with A. castellanii (Ac) after 24 h (B) and 48 h (C). The cells were stained with Gram's crystal violet (magnification, ×1,000).
