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Fig. 1. Protein expression of CT-1 (A) and gp130 (B) during of ES cell differentiation. Determination was performed within the three-dimensional tissue of embryoid bodies. Note that cardiac cell differentiation occurs during day 6 and 8 of embryoid body cell culture (Hescheler et al., 2002). *P<0.05, significantly different to levels at day 1 and day 2 of cell culture in A and B, respectively.