ITGB1 and Duchenne muscular dystrophy: Notably, among all known ligand-receptor pairs, DMD collagen signaling was mainly dominated by collagen I, IV and VI and its receptor Itga1/Itga2 + Itgb1. FAPs were also the most prominent source of laminin either in control and DMD samples, although adipocytes became an important source as well in DMD (Fig. 8).