References
Wikipedia. (2014, January 29). Retrieved June 29, 2014, from http://en.wikipedia.org/wiki/Retinoic_acid
Thiele CJ. Neuroblastoma: In (Ed.) Masters, J. Human Cell Culture. Lancaster, UK:Kluwer Academic Publishers. 1998, Vol 1, p 21-53
SK-N-SH: Human Neuroblastoma Cell Line. (n.d.). Retrieved June 29, 2014, from Memorial Sloan
Kettering Cancer Center website: http://www.mskcc.org/research/technology/human-neuroblastoma-cell-line-sk-n-sh