Time (min)

1
a
Relative abundance
GP-1
b
Relative abundance
GP-2
Time (min)
Supplementary Figure 1 Total ion chromatogram
of transferrin tryptic digest analyzed by on-line
nano RPLC-ESI-LTQFT. (a) Total digest. (b)
Sepharose CL-4B enriched peptides. GP-1
CGLVPVLAENYN(5Hex4HexNAc2Sia)K. GP-2
QQQHLFGSN(5Hex4HexNAc2Sia)VTDCSGNFCLFR