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Microscopic examination of the interaction of the T. atroviride parental strain and the gpr1-silenced transformants with R. solani in the absence (a) or presence (b) of 5 mM cAMP. The co-cultures were incubated until contact between the two fungi. Attachment to and growth alongside the host and coiling around the host hyphae in the presence of cAMP is indicated by black arrows; hyphae growing past each other without mutual recognition are indicated by white arrows.
