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Transmission electron micrographs of mycelial samples, collected after 4 to 5 days of coculture of P. parasitica (Ph) and P. oligandrum (Po), in the region where the two fungi are interacting. (a through c) Cells of the antagonist proliferate in the host hyphae, resulting in host wall alterations (panels a and b, arrows). Labeled wall fragments are released (panel c, arrowheads). (a and b) Bars, 1.5 μm; (c) bar, 0.75 μm. (d) Host cell is perforated in many places (arrow). Bar, 1.5 μm.
