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The ability of cultured cells to generate AP in response to external electrical stimulation. Representative examples of (A) fresh and (B) cultured AP in atrial cells at a stimulation rate of 1, 2, and 3. (C) Average APD50 and APD90 for fresh and cultured cells. (D) Representative examples of fresh and cultured atrial cells loaded with Di-8-ANEPPS to visualize t-tubules.
