CKB and obstructive sleep apnea syndrome: Both CCr treatment and siRNA transfection reduced cell migration of SAOS-LM5 (Fig. 3c, d,e; Supplementary Fig. 3b, 4b, c, 5) and MG63-M8 cells (Fig. 3f; Supplementary Fig. 4d, 5), confirming CKB as a positive regulator of OSA cell migration.