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Fig. 8. Hyphal aggregates differentiation of mycelium from CBEL+ and CBEL- P.p.n. strains in contact with susceptible tobacco roots. The untransformed (A) and EX11-4 CBEL- strain (B,C) were observed under bright-field microscopy either after rosazurin staining (A,B) or directly in the inoculation assay Petri dish (C). Arrows, hyphal aggregates; arrowheads, appressoria. Bars, 40 µm.