This peptide displays a high degree of glycan microheterogeneity resulting mainly from a variable number of mannose residues in each glycan. Both N-linked and O-linked glycans are high mannose. The measured mass is that of a major glycosylated and GPI-anchored form. The measured mass is that of a major glycosylated and GPI-anchored form. The measured mass is that of the peptide after removal by PNGase F of all glycans and the GPI anchor.