GO (Gene ontology) and COG (Cluster of orthologous groups) annotation for the pooling transcriptome assembly of Nymphoides peltata. (a) Functional annotation of the assembled unigenes based on GO category, the functions of the unigenes were divided into three categories. (b) Information of clusters of orthologous groups (COG) classification, the unigenes were mainly clustered into 25 components. (PDF 295 kb)