Phylogenetic trees of PcIR sequences with other Decapoda IR sequences, A is the ML phylogenetic tree, and B is the NJ phylogenetic tree. Procambarus clarkii (red), Litopenaeus vannamei (blue) and Eriocheir japonica sinensis (green), and other Decapoda IRs font are colored black. Moreover, out ring containing IR co-receptors are colored yellow.