We will apply in vivo isotopic tracer methods to address the following specific aims:
Aim 1 : Quantify urea N recycling in cancer patients with and without cachexia and in normal healthy subjects, and evaluate the regulation of this process by a glucose infusion.
Aim 2 : Quantify the incorporate of orally administered N ammonia into a multiple non-essential and branched chain plasma amino acids and urea in the three experimental groups with and without a glucose infusion.
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