Thus, the P-selectin glycoprotein ligand-1 (PSGL-1) is expressed on the surface of MM cells [21,22], playing key roles in the very initial interactions of MM cells with BM endothelial cells [22], by facilitating malignant plasma cell rolling on P-selectin expressed by the microvasculature [16]. The gene discussed is SELPLG; the disease is Miyoshi myopathy.