Fig. 5. Dendrogram of the known leucokinin receptors. A CLUSTAL X protein alignment was performed using the putative TM spanning regions of the known leucokinin receptors. From this a phylogram was produced using the TREEVIEW program. TM domains were predicted using the TMHMM 2.0 program. The scale bar gives an approximation of the number of substitutions per site. The Lymnaea stagnalis (pond snail) receptor is used as an outgroup.