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Fig. 1. Two-dimensional representation of blood protein nitrogen (protein and free
amino acids) and trehalose levels (mg per insect) in normal (filled circles)
fifth instar M. sexta larvae and larvae parasitized by C.
congregata (open circles), maintained over the fourth and fifth stadia on
a chemically defined artificial diet having varying ratios of casein and
sucrose. Values are means ± S.E.M. Dietary nutrient ratios
shown relative to the level of each nutrient (C, casein; S, sucrose) in the
basal chemically defined formulation where 1.0=90 g l-1.