Gene Ontology Classification of the C. sinensis transcriptome. (a) Gene ontology (GO) term assignments to C. sinensis unigenes based on significant plant species hits against the NR database are summarized into three main GO categories (biological process, cellular component, molecular function) and 43 sub-categories. (b) Gene ontology (GO) term assignments to C. sinensis unigenes based on high-score BLASTX matches to the Arabidopsis proteins of NR database are classified into three main GO categories and 41 sub-categories. The left y-axis indicates the percentage of a specific category of genes in that main category. The right y-axis indicates the number of genes in the same category.