Kinematic‐calcium loops unravel impaired excitation–contraction coupling in MELAS‐affected cardioids. - Burattini, Margherita; Pisano, Annalinda; Pignataro, Maria Gemma; d'Amati, Giulia; Pinelli, Silvana; Hoang, Minh Long; Lo Muzio, Francesco Paolo; Miragoli, Michele (Journal of Physiology, 2026)