предшественник
- active precursor
- appropriate precursor
- cold precursor
- common precursor
- direct precursor
- effective precursor
- efficient precursor
- immediate precursor
- labeled precursor
- major precursor
- mobile precursor
- normal precursor
- obligate precursor
- phage precursor
- precise precursor
- radioactive precursor
- single precursor
- sole precursor
- vitamin precursor