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

D M. Supp, et.al., Sp4, a member of the Sp1-family of zinc finger transcription factors, is required for normal murine growth, viability, and male fertility., Developmental biology, 1996, 176
http://rdf.ncbi.nlm.nih.gov/pubmed/8660867