FIG. 7.

Altered sphingolipid content of sur7Δ, ydl222Δ, and ynl194Δ plasma membranes. Mass spectrometry of plasma membrane lipids from the mutant strains showed differences in the composition of IPC sphingolipids. The IPCs varied in the number of hydroxyl groups (subclasses A to D) and in the length of their sphingoid base component (C18 or C20). Error bars are the standard error of proportion. m/z values are as follows: C18-IPC-B, 936; C18-IPC-C, 952; C20-IPC-B, 964; C18-IPC-D, 968; C20-IPC-C, 980.