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. 2012 Sep 21;7(9):e45251. doi: 10.1371/journal.pone.0045251

Figure 11. Morphine alters the inactivation kinetics of TTX-resistant Na+ channels.

Figure 11

A double-pulse inactivation protocol was used to evaluate the inactivation kinetics of Na+ current in the presence of 1 µM TTX (A) and 1 µM TTX with 3 µM morphine (B). Boltzmann analysis (B) reveled that morphine shifted the inactivation curve of TTX-resistant Na+ channels down and to the left, as reflected in a significant reduction of the v0.5 and k values. Activation kinetics were unaffected.