Fig. 7
a An optical microscopic image of a rod-tip cantilever positioned over a single myofibril adsorbed onto a cover slip in a criss-cross fashion (bar 20 μm). b Radial stiffness analysis of the A-band region of single myofibrils. Force–indentation traces are for myofibrils in a rigor and b relaxed states, and dashed lines the best-fit curves to the Hertz equation