precursor

n.

前辈，前驱，先锋，前任；预兆，先兆，初期形式；[核]前驱波，初级粒子；预报器

复数：precursors

precursor chemicals易制毒化学品

1. 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。
2. Her precursor as school principal was an eminent educator.
   她任校长前是一位卓越的教育家。
3. Opposition by colonists to unfair taxation by the British was a precursor of the Revolution.
   殖民地居民对英国不公正税收的反抗预示着革命的到来。
4. Lysine is a precursor of certain alkaloids.
   赖氨酸是某些生物碱的前体。

The precursor of Alzheimer's disease amyloid A4 protein resembles a cell-surface receptor
Determination of malonaldehyde precursor in tissues by thiobarbituric acid test.
Human tumour necrosis factor: precursor structure, expression and homology to lymphotoxin
β-Secretase Cleavage of Alzheimer's Amyloid Precursor Protein by the Transmembrane Aspartic Protease BACE
Segregation of a missense mutation in the amyloid precursor protein gene with familial Alzheimer's disease.
Alzheimer-type neuropathology in transgenic mice overexpressing V717F β-amyloid precursor protein
Tyrosine 687 phosphorylated Alzheimer's amyloid precursor protein is retained intracellularly and exhibits a decreased turnover rate
The ubiquitinproteasome pathway is required for processing the NF-κB1 precursor protein and the activation of NF-κB
ChemInform Abstract: Formation of High㏎uality CdTe, CdSe, and CdS Nanocrystals Using CdO as Precursor.
Impaired recruitment of bone-marrow-derived endothelial and hematopoietic precursor cells blocks tumor angiogenesis and growth.