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P19-SI cardiocytes form clusters within aggregates. Six – day 27 beating P19-SI aggregates were pooled, fixed and sectioned as described in Experimental Procedures so as to illustrate clusters of cardiomyocytes within several individual aggregates. The sections were stained with DAPI (blue) to display the nuclei, and with alpha-myosin heavy chain mAb (green) to locate the cardiomyocytes.
