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Toxin-induced Ca2+-dependent Cl− currents in Xenopus oocytes. Shown are representative traces of strong responses elicited in voltage-clamped oocytes injected with native PMT (2 fmol; A), rPMT (21 fmol; B), ToxAN4 (330 fmol; C), ToxAN2 (520 fmol; D), and ToxAN5 (1,320 fmol; E). I1 denotes the first peak current from mobilization of intracellular Ca2+; I2 denotes the second peak current from Ca2+ influx through capacitative Ca2+ channels on the plasma membrane.
