• Furthermore, the Krebs cycle intermediates are replenished by uptake of glutamine, which leads to increased production of amino acid precursors [ 8 ]. (degruyter.com)
  • One-carbon units in a variety of oxidation states may be attached to the N5 nitrogen atom of the pteridine ring and/or the N10 nitrogen atom of the p-aminobenzoyl group. (wikipedia.org)