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V̇e, V̇e/V̇o2, Vt, RR, and HR at postnatal age P25 in rat pups from dams fed a normal diet (dark bars) or a tryptophan-deficient diet (light bars). Significant differences between control and tryptophan-deficient diet treatment (t-test): *P < 0.05, **P < 0.01, ***P < 0.001; n in each case is as in Fig. 1.
