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In situ localization of C4H and PAL mRNAs in parsley leaf buds 6 h postinoculation with P. sojae. The fungal infection site (A, arrow) was visualized by autofluorescence of the developing necrotic spot under UV/blue light of 365 nm. The same and an adjacent cross-section were hybridized with 35S-labeled C4H (B) and PAL (C) antisense riboprobes, respectively. Magnification bar = 100 μm.
