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KOVANEN, V. Intramuscular extracellular matrix: Complex environment of muscle cells. Exerc. Sport Sci. Rev., Vol. 30, No. 1, pp 20–25, 2002. Different collagen types among other extracellular matrix molecules, remodeling of the extracellular matrix with the aid of matrix metalloproteinases, and integrin-related signaling can enhance the adaptive and recovery potential of muscle cells.