Dynamically tunable hydrogels by transient application of a 10,000-Oe magnetic field (A,B). Representative images of (C) cell morphology and (Ci) YAP in the “off-on” condition. Representative images of (D) cell spreading and (Di) YAP in the “on-off” condition. Quantification of (E) cell area, (F) cell shape index, and (G) nuclear to cytoplasmic YAP ratio. DAPI (blue), F-actin (red), and YAP (green). Scale = 25-μm. *P < 0.05. (n > 25 cells per condition).