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Loading kinetics of G. margarita (A) and G. intraradices (B) germ tubes with BCECF-AM at the tip (2 μm) and 9.5 μm behind the tip. ▴, Cytosolic pH; □, total fluorescence at 450-nm excitation. G. intraradices cytosolic pH values are estimations using the calibration relationship established with G. margarita.
