The top 25 features ranked by CHI- and IG- based feature selection methods.

aThe feature ‘ExE’ represents a 1-spaced residue pair of ‘EE’, where x stands for any amino acid. The same representation was applied to other k-spaced residue pairs.bThe k-spaced amino acid pairs in bold type mean they are consistently ranked as the top-25 features by both feature selection methods.

a. 特征“ExE”表示间隔为1的残基对“EE”，其中x指代任意氨基酸。该表示规则同样适用于其他k间隔残基对。
b. 以粗体标注的k间隔氨基酸对，指经两种特征选择方法均一致位列前25位的特征。