L (FtL) and H (FtH) chain ferritin was analyzed in cell extracts of fibroblasts from three different healthy control probands, our patient (E104X), and patient fibroblasts with forced FtL expression (E104X-Lwt) by an ELISA. The results are shown as nanograms/milligram of ferritin of total soluble proteins. The values are the means and SD of three independent experiments.