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

Valeria. Vasta, et.al., Modulation of Leydig cell function by cyclic nucleotide phosphodiesterase 8A., Proceedings of the National Academy of Sciences of the United States of America, 2006, 103
http://rdf.ncbi.nlm.nih.gov/pubmed/17172443