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Functional
analysis of contracting area within the EBs. (a) Calcium
transients of human ES cell–derived cardiomyocytes as determined by fura-2
fluorescence. A typical calcium transient is shown on the left, and
continuous recording is shown on the right. Tp, time to peak; Tt,
total transient time; T1/2, time to half-peak relaxation. (b)
Typical extracellular electrophysiological recordings from different areas of
the EB. Note the presence of a sharp and slow component. R, ratio.
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