Amino acid usage in chicken proteins.

The relative amino acid usage (RAAU) for the total data set, high expression data set and low expression data set were calculated, respectively. ΔRAAU for a given amino acid was defined as the difference between the average RAAU of genes with high and low expression [significance tested using the one-way analysis of variance (ANOVA) by SAS]. * represents P <0.05; ** represents P <0.01; *** represents P <0.0001. Amino acid usage in chicken proteins.