Erythrocyte composition (wt % total fatty acid composition) of combined long-chain n-3 fatty acids, eicosapentaenoic acid (EPA, 20:5n-3)+docosahexaenoic acid (DHA, 22:6n-3)(‘omega-3 index’)(A) and arachidonic acid (AA, 20:4n-6)(B), and the AA/EPA+DHA (C) and the adrenic acid (ADA, 22:4n-6)/AA (D) ratios in control (CON, n=10), control+risperidone (CON+RSP, n=10), n-3-deficient (DEF, n=10), and n-3-deficient+risperidone (DEF+RSP, n=10) rats. Values are group means ± S.E.M. *P≤0.05, ***P≤0.0001 vs. controls, #P≤0.05 vs. DEF rats.