生物信息学：导论与方法(北京大学)
Biological pathway
- metabolic pathways
- gene regulation pathways
- signal transduction pathways
通路数据库：
KEGG (最常用)
biocarta/biocyc.....
简介KEGG数据库
different elements in pathway:
长方形：gene product, mostly protein but including RNA
圆圈：other molecule，mostly chemical compound
different hieratical interactions:
protein-protein interactions
gene expression relations
enzyme-enzyme relations
KEGG pathway的数据存储方式
KEGG markup language format KGML
