Data "Confined Sandwich-like microenvironments tune myogenic differentiation" Nomenclature: Sandwich-like samples: "SW" 2-Dimensional samples: "2D" Coatings of the dorsal substrate: "BSA" (albumin), "COL I" (collagen I), "FN" (fibronectin), "FN-HFN7.1" (fibronectin with cell-attachment domain blocked) and "VN" (vitronectin). Otherwise noticed the coating is always fibronectin. Data analysed as stated in Materials and methods.