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Erez-Roman R, Pienik R, Futerman AH (2010). "Increased ceramide synthase 2 and 6 mRNA levels in breast cancer tissues and correlation with sphingosine kinase expression". Biochemical and Biophysical Research Communications. 391 (1): 219–223. doi:10.1016/j.bbrc.2009.11.035. PMID19912991.