Macrophages

Role in Muscle Regeneration
Obviously about mice but we should should look for human research:

Macrophages promote muscle membrane repair and muscle fibre growth and regeneration during modified muscle loading in mice in vivo http://www.ncbi.nlm.nih.gov/pmc/articles/PMC2075127/

Crucial Role Of Macrophages In Muscle Regeneration Uncovered By EMBL Scientists http://www.medicalnewstoday.com/articles/164947.php

http://www.sciencedaily.com/releases/2009/11/091116103838.htm

Protein required for macrophage function TRPV2: http://www.sciencedaily.com/releases/2010/02/100217182348.htm

Macrophage Activation http://www.rndsystems.com/cb_detail_objectname_SP04_MacrophageActivation.aspx

Macrophages: The 'Defense' Cells That Help Throughout the Body http://www.sciencedaily.com/releases/2010/08/100826141232.htm

Why Fish Oils Work Swimmingly Against Inflammation and Diabetes http://www.sciencedaily.com/releases/2010/09/100902121049.htm

http://en.wikipedia.org/wiki/Macrophage