“…Brillouin microscopy has been recently used to characterize the mechanical properties of eye tissue (Besner, Scarcelli, Pineda, & Yun, ; Scarcelli, Besner, Pineda, Kalout, & Yun, ) in vivo, fibrous proteins of the extracellular matrix (Palombo et al, ), and cellular mechanics (Antonacci & Braakman, ; Elsayad et al, ; Scarcelli et al, ; Zhang, Nou, Kim, & Scarcelli, ). Very recently, we acquired the first mechanical images of a mouse embryo with the Brillouin microscope (Raghunathan et al, ), demonstrating that this technique had the promising capability of characterizing the biomechanics of embryonic tissue in situ .…”