Phylogenetic tree of H. halys glutathione S-transferase (GST)-associated proteins. Contains, microsomal (green), theta (blue), delta (red) and sigma (orange) clades. Two prostaglandin E isoforms (purple) are used as outgroups to all GSTs. Uncolored leaves could not be assigned to family based on annotation. Bootstrap support (100 replicates) is indicated on nodes.