CBLN1 and type 2 diabetes mellitus: Among 11 sphingolipids altered, 6 species of sphingomyelins precisely SM (d18:1_23:3, p<0.05), (d32:4 and d43:1, p<0.04), (d32:1 and d42:2, p<0.02), (d31:1, p<0.001), and 2 species of ceramides, namely Cer(d18:1_24:1, p<0.003) and Hex1Cer(d34:1, p<0.05) were higher in T2DM patients with MCI compared to NC patients.