We calculated the activity profiles in Fig. 9B from the raw data in Fig. 9A by averaging the spike - density functions of
nearby cells according to a Gaussian weighting function (width σ = 0.25 mm) and sorting them according to their location in the motor map (Methods).
As the wound heals, the gel breaks down into amino acids — the building blocks of proteins — that can be taken up by
nearby cells and used for tissue repair,
according to MIT neuroscientist Rutledge Ellis - Behnke.