ML133 is a potent and selective blocker of the inwardly rectifying Kir2 potassium channel, IC50s = 1.8, 2.8, 2,9, and 4.0 µM for Kir2.1, Kir2.6, Kir2.2, and Kir2.3, respectively.1 Intrathecal injection of ML133 attenuated the proliferation of microglia a
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