Results for genome-wide significant summary data are available on the table. [Other information are available from the corresponding author (Lei Chen, M.D., E-mail: leilei_25@126.com} on reasonable request.] The single-cell data of 4.5-9 (from Asp M, et al.) and 5-25 (from Cui Y, et al.) gestational weeks human embryonic hearts could be found in https://www.sciencedirect.com/science/article/pii/S0092867419312826 and https://www.sciencedirect.com/science/article/pii/S2211124719301081?via%3Dihub, respectively.