Okokuqala, i-tryptophan, njenge-amino acid, idlala umsebenzi obalulekile wokulawula ohlelweni lwezinzwa. Kuyisandulela sama-neurotransmitters asiza ukulawula nokulinganisa amakhemikhali ebuchosheni, adlala indima ebalulekile ekuthuthukiseni imizwa, ukulala, nokusebenza kwengqondo. Ngakho-ke, i-tryptophan ...
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