Abstract
Recoveries of C14O2 after administration of uniformly labeled compounds to chicks averaged 10% for threonine, 25% for histidine, 40% for valine, and 50% for glucose. Peak Cl4O2 production occurred 2 hrs. after administration of histidine, about one hour after administration of other compounds. Neither previous diet (complete or lacking the amino acid injected) nor 10-fold variations in amounts administered appeared to affect the results.

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