CAT是一个分析核酸中密码子使用偏性（codon usage bias）、密码子偏差系数（Codon Deviation Coefficient）等特征的分析工具。
CAT (Composition Analysis Toolkit) is a software package that includes a novel measure of codon usage bias, Codon Deviation Coefficient (CDC). Unlike previous measures, CDC effectively accounts for background nucleotide composition in estimating codon usage bias and utilizes a bootstrap assessment of the statistical significance of codon usage bias.
软件下载地址：http://cbrc.kaust.edu.sa/CAT/
相关文献：
Zhang, Z., Li, J., Cui, P., Ding, F., Li, A., Townsend, J.P., and Yu, J. (2011) Codon Deviation Coefficient: a novel measure for estimating codon usage bias and its statistical significance