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Fig. 1. Intracellular free-pool phenylalanine specific radioactivities in the intestine, heart, liver, brain, muscle and lung of anoxia-exposed (filled circles) and normoxia-exposed (open circles) turtles. N=6 except for the muscle 1 h of anoxia value, where N=3. Values are means ± S.E.M. (experiment 1).