 <translate> I got a question for you: Pepsin is an endopeptidase that breaks down proteins into smaller peptides (that is, a protease). It is produced in the stomach and is one of the main digestive enzymes in the digestive systems of humans and many other animals, where it helps digest the proteins in food. Pepsin has a three dimensional structure, of which one or more polypeptide chains twist and fold, bringing together a small number of amino acids to form the active site, or the location on the enzyme where the substrate binds and the reaction takes place. Pepsin is an aspartic protease, using a catalytic aspartate in its active site.

Answer this question: where is pepsin secreted in the digestive system?
Let's think first: <yor> Mo ní ìbéèrè kan fún yín: Pepsin jẹ endopeptidase tí ó ń tú àwọn protein sí àwọn peptides kéékèèké (ìyẹn, protease). Inú ikùn ni wọ́n ti ń ṣe é, ó sì jẹ́ ọ̀kan lára àwọn èròjà tó ń mú kí oúnjẹ dà nínú ara èèyàn àti ọ̀pọ̀ àwọn ẹranko mìíràn, níbi tó ti ń ṣèrànwọ́ láti jẹ àwọn èròjà protein tó wà nínú oúnjẹ. Pepsin ní àlàfo mẹ́ta, nínú èyí tí ẹyọ polypeptide kan tàbí jù bẹ́ẹ̀ lọ máa ń yí ara wọn ká tí wọ́n sì máa ń dì, tí wọ́n á wá kó àwọn èròjà amino acid díẹ̀ jọ láti di ibi tí èròjà náà ti ń ṣiṣẹ́, tàbí ibi tí èròjà náà wà lórí èròjà náà níbi tí èròjà náà ti ń so pọ̀ tí ìyípadà náà sì ti wáyé. Pepsin jẹ aspartic protease, lilo aspartate catalytic ni aaye ti nṣiṣe lọwọ rẹ.  Dáhùn ìbéèrè yìí: Ibo ni wọ́n ti ń sẹ́ pépsín jáde nínú ọ̀nà tí ara ń gbà ṣe oúnjẹ? Ẹ jẹ́ ká kọ́kọ́ ronú: 