New research implicates immune system cells in muscle healing

According to genome-wide expression analysis, different Treg populations are distributed in space according to their similarity: The position of the novel muscle Treg cells indicates that they are a unique population, more similar to the recently described fat Treg cells than to the most-studied lymphoid tissue Tregs.

http://medicalxpress.com/news/2013-12-implicates-immune-cells-muscle.html