Fabrication of substrate and cellular microbiaxial stretching device: (a) schematic representation of substrate fabrication process, (b) schematic representation of the C$μ$BS device. Inset: cell substrate, (c) grip strain versus measured substrate strain under applied uniaxial grip strain (n = 10), and (d) grip strain versus measured substrate strain under equibiaxial grip strain. Error bars: standard deviation (n = 10).