The ELF is comprised of a heterogeneous mixture of mucus, cells, proteins, and low molecular weight antioxidants [4]
A prolonged deficiency is otherwise known as scurvy. And no, scurvy is not limited to pirates and sailors, but it was way back in 1747 that James Lind deduced through a trial on sailors (who were very likely to suffer from it), that oranges and lemons treated this mysterious illness
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Glycyl-L-histidyl-L-lysine, the human tripeptide that Loren Pickart isolated from plasma and characterized in Nature New Biology in 1973, weighs 340.4 daltons 17
doi: 10.1371/journal.pone.0009694