Fig. 5. Abundance and function of symbiotic bacteria Buchnera sp. in 8-day-old aphids on diets of different sucrose concentration. (A) Number of copies of Buchnera gene dnaK normalised to total DNA content. (B) Free amino acid content normalised to aphid mass. Values are means ± s.e.m. Mean values that are not significantly different (P>0.05) are indicated by the same letter.