STAR protocols, Volume 6, Issue 1, 26 4 2025, Pages 103679 Massive expansion and cryopreservation of functional human induced pluripotent stem cell-derived cardiomyocytes. Maas RGC, Lee S, Harakalova M, Snijders Blok CJB, Goodyer WR, Hjortnaes J, Doevendans PAFM, Van Laake LW, van der Velden J, Asselbergs FW, Wu JC, Sluijter JPG, Wu SM, Buikema JW