glutathione is an important peptide antioxidant found in cells Glutathione - Wikipedia
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10.1146/annurev.physiol.66.032102.150251 Annu

The absorption of most amino acids from the intestine, as well as uptake into cells of the various tissues of the body, requires an active transport process that is dependent upon Na + or H + co-transport

Seven proteins were only detected in controls and not in sarcoidosis cases, while five proteins were present only in sarcoidosis cases but not in control BALF

Am J Hematol 92(9):845-850, 2017