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Effects of sodium manipulation on brain size and thoracic protein in cabbage whites. Cabbage white butterflies were reared on low- or medium-sodium artificial diets (high-sodium diets resulted in high mortality and were not analyzed further). Shown are differences in (A) thoracic protein and (B) relative brain volume for adult males and females. For brain volume, least square means (and SEs) are plotted from a model that also included body size (wing length) (statistics in Table 4).
