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

G R. MacGregor, et.al., Symplastic spermatids (sys): a recessive insertional mutation in mice causing a defect in spermatogenesis., Proceedings of the National Academy of Sciences of the United States of America, 1990, 87
http://rdf.ncbi.nlm.nih.gov/pubmed/2164218