I-amino acid tryptophan inezinzuzo eziningi zezempilo, kodwa imiphumela yayo empilweni yobuchopho kufanele iphawulwe. Kuthinta imizwa yakho, ukuqonda nokuziphatha, kanye nemijikelezo yakho yokulala. Kudingeka umzimba ukwenza amaprotheni namanye ama-molecule abalulekile, okuhlanganisa lawo abalulekile ukuze umuntu alale ngokwanele futhi...
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