Interestingly, when applying triple staining for PSA-NCAM, NCAM and EpCAM we found the putative MM cell fraction, NCAM+PSA-NCAM+EpCAM−, to be expressed in 2.5±2.2% of total cells, while NCAM+PSA-NCAM+EpCAM+ from later developmental stages in 4.3±0.3% of total cells (Fig. 4), indicating that PSA-NCAM and NCAM localize in similar progenitor areas. This evidence concerns the gene NCAM1 and Miyoshi myopathy.