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J Clin Endocrinol Metab (2007) 92:90210

Gln, a nonessential amino acid abundant in the bloodstream, along with its metabolites lutamate and ketoglutarate (-KG), serves as a vital source of carbon and nitrogen, providing essential raw materials for the synthesis of nucleotides and amino acids ( Although some Gln metabolic inhibitors have entered clinical trials, the heterogeneity among tumors complicates their effectiveness

This is why hCG is considered a marker for implantation 5

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