Phospholamban phosphorylation at the serine 16 residue in nonfailing, pediatric left and right ventricular myocardium; representative Western blot (A) and quantitation (B) are shown. GAPDH was used as a loading control. N=7 for each group. Ser16, serine 16 residue; pPLN, phospholamban phosphorylation; PLN, phospholamban; GAPDH, glyceraldehyde 3-phosphate dehydrogenase; NF, nonfailing; LV, left ventricle; RV, right ventricle.