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Spermidine content in Buchnera. Buchnera cells were isolated from about 20 individuals each of 10-, 20-, 30-, 40-, and 50-day-old adult aphids. Spermidine content is presented in terms of the amount per cell (A), per volume (B), and per milligram of protein (C). Each data point is the mean ± standard error of five replicate groups.
