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

Cuiling. Li, et.al., Anterior visceral endoderm SMAD4 signaling specifies anterior embryonic patterning and head induction in mice., International journal of biological sciences, 2010, 6
http://rdf.ncbi.nlm.nih.gov/pubmed/20941375