Brain Transcriptome Database (BrainTx)http://rdf.ncbi.nlm.nih.gov/pubmed/

Mark J. Zylka, et.al., Atypical expansion in mice of the sensory neuron-specific Mrg G protein-coupled receptor family., Proceedings of the National Academy of Sciences of the United States of America, 2003, 100
http://rdf.ncbi.nlm.nih.gov/pubmed/12909716