Figure 2.

Illustrative phylogenetic tree depicts the clustering of biogenic amine receptors (Clusters 20–22) in rectangular (Top) and radial (Bottom) displays also a pictorial representation of tree topologies has been given to guide the types of cluster association. (A) denotes the cluster association for HC and CC, wherein HC refers to the association of GPCRs from only human genome, CC refers to the inter genomic cluster association of GPCRs from both human and C.elegans. (B) refers to the NC association, where the occurrence of C.elegans GPCRs has observed at adjacent or neighbouring to HC. (C) refers to the association for species specific (SS), Co-clusters (CC) and neighbor member (NM) occur in the tree topology. (Refer section “Terminologies used to describe phylogeny” also).