Vim muaj kev paub txog kev tiv thaiv ib puag ncig los ntawm cov tuam txhab thiab cov neeg siv khoom thoob ntiaj teb, kev npaj enzyme, uas yog cov khoom siv hluav taws xob zoo thiab muaj cov yam ntxwv ntawm kev ua haujlwm siab, kev siv nyab xeeb, thiab kev tiv thaiv ib puag ncig, ...
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