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Ion channels formed by C. trachomatis MOMP lacking the VS4 domain. (a) With 250 mM KCl cis versus 50 mM KCl trans, the reversal potential for C. trachomatis MOMP lacking the VS4 domain is −30 mV (arrow). (b) Longer recordings at membrane potentials of +100 mV and −100 mV (low-pass filtered at 0.2 kHz, with the zero-current baseline, i.e., no open channels, indicated in each case by a dotted line). The standard voltage-clamp protocol is also shown.
