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Relationship between the mass of the larva at the beginning of the last larval instar and the critical weight (CW), at which the decision to initiate the endocrine events that lead to metamorphosis is made. Each point is from a different genetic strain of Manduca that differs in body size and development time (G.D., D.A.R. and H.F.N., unpublished observations). The regression is: CW = 5.3*initial mass - 0.8 (R2 = 0.95).
