Fig. 4. Indexes of fatty acid unsaturation of phosphatidylethanolamine in membrane fractions. (A) Percentage of unsaturated fatty acids and unsaturation index of phosphatidylethanolamine of raft (triangles) and RDPM (squares) from 5°C-acclimated (open symbols) and 20°C-acclimated (filled symbols) fish. The dotted lines are isopleths, as described in Fig. 2. (B) Percentage of monounsaturated fatty acids and (C) percentage of polyunsaturated fatty acids in raft and RDPM from 5°C-acclimated (open bars) and 20°C-acclimated (filled bars) fish. All values are means ± S.E.M., N=4. Raft, raft-enriched plasma membrane; RDPM, raft-depleted plasma membrane.