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Regarding human cysteine bioavailability, it is thought that the bulk of absorbed amino acids come through enterocyte absorption, in the small intestine, and amino acids in the colonic lumen will be mainly used for bacteria metabolism or may be absorbed as di- or tri-peptides but very few as free amino acids

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Crit Rev Food Sci 63:89929016 Dalal M, Sahu S, Tiwari S, Rao AR, Gaikwad K (2018) Transcriptome analysis reveals interplay between hormones, ROS metabolism and cell wall biosynthesis for drought-induced root growth in wheat