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What does I(K) stand for?

I(K) stands for delayed rectifier K(+) current

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hERG forms the major portion of one of the ion channel proteins (the 'rapid' delayed rectifier current (IKr)) that conducts potassium (K+) ions out of the muscle cells of the heart (cardiac myocytes), and this current is critical in correctly timing the return to the resting state (repolarization) of the cell membrane during the cardiac action potential. [2] Sometimes, when referring to the pharmacological effects of drugs, the terms "hERG channels" and IKr are used interchangeably, but, in the technical sense, "hERG channels" can be made only by scientists in the laboratory; in formal terms, the naturally occurring channels in the body that include hERG are referred to by the name of the electrical current that has been measured in that cell type, so, for example, in the heart, the correct name is IKr.