Fig. 3. Indexes of fatty acid unsaturation of phosphatidylcholine in membrane fractions. (A) Percentage of unsaturated fatty acids and unsaturation index of phosphatidylcholine 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 (MUFA) and (C) percentage of polyunsaturated fatty acids (PUFA) in raft and RDPM from 5°C-acclimated (open bars) and 20°C-acclimated (filled bars) fish. Bars with a common lower case letter do not differ significantly. All values are means ± S.E.M., N=4. Raft, raft-enriched plasma membrane; RDPM, raft-depleted plasma membrane.