Text mining of full-text journal articles combined with gene expression analysis reveals a relationship between sphingosine-1-phosphate and invasiveness of a glioblastoma cell line. - Jeyakumar Natarajan; Daniel P. Berrar; Werner Dubitzky; Catherine J. Hack; Yonghong Zhang; Catherine DeSesa; James R. Van Brocklyn; Eric G. Bremer (BMC Bioinform., 2006)