PURINE AND PYRIMIDINE NUCLEOTIDES INCORPORATED INTO MATERNAL AND FETAL RIBO NUCLEIC ACID DERIVE ALMOST EXCLUSIVELY FROM SYNTHESIS DE NOVO IN THE PREGNANT MOUSE

• 插入怀孕老鼠的中母体和胎儿核糖核酸的嘌呤和嘧啶核苷酸几乎都来自从头合成