XBP1 and Miyoshi myopathy: There are still some unsolved questions: 1, the mechanisms by which Gm40600 reduces Blimp1; 2, the physiological function of Gm40600 in Prdm1 and Xbp1 expression, and nonmalignant PC generation/maintenance; 3, whether there are human orthologs of the Gm40600 gene; 4, the pathogenic role of the human ortholog of Gm40600 gene in MM; 5, whether regulation of the Gm40600 human ortholog can be used to treat MM.