neuroepithelioma cell line derived from a metastatic supra-orbital human brain tumor, "SK-N-MC was isolated in September of l971 and was found to have moderate dopamine - beta - hydroxylase activity as well as formaldehyde induced fluorescence indicative of intracellular catecholamines." - ATCC. (Biedler, et al. Morphology and Growth, Tumorigenicity, and Cytogenetics of Human Neuroblastoma Cells in Continuous Culture. Cancer Research 33, 2643-2652, November 1973.)