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(a) The field potential amplitude rapidly increased until day 23 and declined at day 27. The turning point agreed with that of the beat interval. (b) The field potential amplitude upstroke speed increased from 15.3 μV/ms at day 18 to 122.9 μV/ms at day 26 and declined at day 27. (c) Conduction velocity was calculated at each day. There was an increment of conduction velocity as the development of hESC-CMs. Results from two samples were consistent.
