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Fig. 4. Osmotic pressure of the haemolymph of 8-day-old aphids reared on either
chemically defined diets of different sucrose concentration (circles) or on
plants (triangles) with phloem sap sucrose concentration as shown in
Table 1. Values are means
± s.e.m. Mean values that are not significantly different
(P>0.05) are indicated by the same letter.