Urine samples were obtained from 1-, 5-, and 12-month-old WT nude and DMD nude rats. Urinary titin was measured using a Mouse Titin N-Fragment Assay Kit (27,602, Immuno-Biological Laboratories Co., Ltd.). Urinary creatinine (Cr) concentrations were measured using a Lab Assay Creatinine kit (636–51011, Fujifilm Wako Pure Chemical Corporation Ltd.) (Maruyama et al., 2016 (link)).
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