您要查找的是不是：
- precursor rRNA pre-rRNA
- precursor rRNA(pre-rRNA) 前核糖体RNA, rRNA前体
- The precursor of the modern car was a horseless carriage with a petrol engine. 现代汽车的前身是不用马拉的，装有汽油发动机的车子。
- Thefirst telephone was the precursor of modern communications networks. 最早出现的电话是现代通讯网的雏型。
- The precursor or stem cell of a plasma cell. 成浆细胞浆细胞的前体细胞或干细胞
- A precursor cell of a melanocyte or melanophore. 成黑素细胞产生黑素细胞的母体细胞
- Error is often the precursor of what is correct. 错误常常是正确的先导。
- The precursor or stem cell of a plasmacell. 成浆细胞浆细胞的前体细胞或干细胞。
- An originator of a line of descent;a precursor. 前辈家族血脉的开始者；先驱
- An originator of a line of descent; a precursor. 前辈家族血脉的开始者;先驱。
- A severe cold may be the precursor of pneumonia. 重伤风可能是急性肺炎的先兆。
- Lysine is a precursor of certain alkaloids. 赖氨酸是某些生物碱的前体。
- Like mRNA, both tRNA and rRNA are transcripts of chromosomal DNA. tRNA及rRNA同mrna一样，都是染色体DNA的转录产物。
- The first ribin us a precursor of spring. 头一只知更鸟是春天的先兆。
- ARJ21 is seen as the precursor to a jumbo jet. ARJ21型飞机被看作是大型喷气式飞机的前身。
- The result agreed with the former result of 12S rRNA gene studies. 同时，根据扩增情况，计算了12种鹭科鸟类的遗传距离，重建系统发生树。
- It is partially composed of the rRNA we just spoke of. 这是部分组成的核糖体RNA我们刚才谈到的。
- Her precursor as school principal was an eminent educator. 她任校长前是一位卓越的教育家。
- Crazing is the invariable precursor of brittle fracture. 出现小裂纹必然是脆性断裂的前兆。
- Now many biologists still regard SSU rRNA tree as the standard tree of life. 现在许多生物学家仍将SSU rRNA树看作标准的生命之树。
