The in vitro proliferative response to ConA of co-cultures of purified T lymphocytes (L) and purified accessory cells (M) isolated from mice fed diets containing different levels of n-3 PUFA for two weeks; lymphocytes from each diet source (LS, LD, LF2, LF4) were co-cultured with accessory cells from each diet source (▪ (M)S, (M)D, (M)F2, □ (M)F4) in a 4 × 4 factorial design; S, Safflower oil diet; F2, 2% Fish oil diet; F4, 4% Fish oil diet; D, DHA-enriched diet; Mean ± SEM (n = 3–5 mice); no statistically significant dietary effects were detected.