Northern blot analysis of glypican-1 from cardiac muscle (CM) and skeletal muscle (SM). Membrane of glypican mRNA from CM (A) stained with ethidium bromide (upper) and hybridized with glypican labeled probe (lower). B. Bars represent the mean values ( ± SE) of relative density (optical density of proteoglycan/optical density of 28S rRNA * 100) from CM and SM in the 4 groups. *P < 0.05; ***P < 0.001 compared with control.