The heart would develop normally; the ECM composition does not affect cardiomyocyte differentiation or contraction The ECM surrounding these cardiomyocytes would become more rigid, allowing for less contractility The cardiomyocytes would no longer contract The developing cardiomyocytes would differentiate into contractile cardiomyocytes instead of pacemaker cardiomyocytes The cardiomyocytes would form a squamous epithelial layer

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A:

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