TABLE 1. N-glycan structures assigned by PGC-LC-ESI-ion trap MS/MS. N-glycan structures found in formalin-fixed paraffin-embedded ovarian cancer tissue (P1 and P2) by PGC-LC-ESI-MS/MS (singly negatively charged monoisotopic masses ([M-H]^1- were calculated from their observed doubly negatively charged monoisotopic masses ([M-2H]^2-), matching composition and proposed structure. Y = Yes, n = No; observed in the patient samples.