Electrophysiological properties of Neo^r, Puro^r-selected, hESC-derived cardiomyocyte spheroids at day 20 of differentiation.

(A) The dominant electrophysiological phenotypes of action potentials (APs) of cardiomyocytes recorded from day 20 CSs. (B) Some cardiomyocytes displayed more hyperpolarized MDP and faster Vmax. Left panels (a and b) show expanded time scale and right panels show 3 APs. (C) The summary table of electrophysiological parameters of action potentials.