Electropherograms of sialyloligosaccharides from: (A) mixture of 12 standard sialyloligosaccharides; (B) colostrum sample from one mother in Boston area; (C) mature milk sample from one mother in Boston area. 1, MSMFLNnH; 2, MSLNnH I; 3, MSMFLNH I; 4, SLNFP II; 5, LST b; 6, LST c; 7, LST a; 8, DSMFLNH; 9, 3'-S-3-FL; 10, 6'-SL; 11, 3'-SL; 12, DSLNT.