HPLC analysis of the N-linked oligosaccharide of CWPs from the YlktrΔ mutant strains. The N-linked oligosaccharide profiles of CWPs from Yloch1Δ (A), Yloch1Δ Ylmpo1Δ (B), Yloch1Δ Ylktr1,2,3,4Δ (C), Yloch1Δ Ylmpo1Δ Ylktr1,2,3,4Δ (D), and Yloch1Δ Ylmpo1Δ::YlMPO1 (E) mutant strains were compared. Man8GlcNAc2-AA was used as a standard AA-sugar chain.