text:  Fiona Biological Replicate 4 Skeletal muscle tibialis anterior (TA) from fiona transgenic line Male mice from fiona transgenic line (dystrophin-deficient with a transgene expressing high level of full length utrophin) were sacrificed by asphyxiation with carbon dioxide at 56 days old. Skeletal muscle tibialis anterior (TA) were dissected bilaterally and pooled. Tissue samples were flash-frozen in liquid N2 and stored at -80ºC until RNA extraction.