Heterocyclic compounds yog dav faib nyob rau hauv cov xwm, accounting rau ze li ntawm ib feem peb ntawm cov organic tebchaw paub, thiab yog dav siv.Ntau yam tseem ceeb, xws li chlorophyll, heme, nucleic acids, thiab qee cov tshuaj ntuj thiab hluavtaws uas muaj txiaj ntsig zoo heev hauv kev siv tshuaj kho mob, co ...
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