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

S. Myöhänen, et.al., Nucleotide sequence of mouse spermidine synthase cDNA., DNA sequence : the journal of DNA sequencing and mapping, 1994, 4
http://rdf.ncbi.nlm.nih.gov/pubmed/7803821