存在于RNA而非DNA中的一种含氮碱基。
Uracil A nitrogenous base that is found in RNA but not in DNA .
蛋白质、氨基酸和含氮碱基快速热解时，含氮污染物以NH3为主。
NH3 was the main nitrogen pollutant during rapid pyrolysis of protein , amino acids , and nucleobases .
含氮碱基