(a) Biomaterial-mediated regeneration. Upon injury, quiescent muscle satellite cells are delivered within a biomaterial. Biomaterial encapsulation provides initial protection of the transplanted cells from inflammation. (b) Biomaterial promotes cell survival by providing integrin attachment sites. Donor cells within the biomaterial activate, self-renew, proliferate, migrate, and differentiate to induce host muscle regeneration. Encapsulated growth factor is released in a controlled manner, as the biomaterial is degraded by the cell-secreted proteases.