Amino Acid Sequence|Animals|Binding Sites|Brain|Brain Chemistry|Computational Biology|Conserved Sequence|Databases, Protein|Evolution, Molecular|Genome|Humans|Ligands|Markov Chains|Mice|Models, Statistical|Pattern Recognition, Automated|Peptide Hormones|Receptors, G-Protein-Coupled|Sequence Alignment|Sequence Analysis, Protein|Sequence Homology, Amino Acid|Species Specificity