Figure 2From: Investigation of ovarian cancer associated sialylation changes in N-linked glycopeptides by quantitative proteomics Tandem mass spectra of doubly charged ions of heavy CD 3 CO- VVLHPD( 18 O)YSQVDIGLIK- COCD 3 and CH 3 CO- VVLHPD( 18 O)YSQVDIGLIK- OCCH 3 peptides as identified by LTL quantitative proteomics in normal and ovarian cancer sera analysis. Back to article page