FN1 and Duchenne muscular dystrophy: To confirm the involvement of FN1, FYN, FBN1, PRKACB and COL1A2 in DMD progression, the levels of mRNA and protein expression of Fn1, Fyn, Fbn1, Prkacb and Col1a2 in mdx and C57 mice at 2 and 4 months (M) of age were measured by using (RT-q) PCR and WB analysis.