Basic Red 51, a permitted semi-permanent hair dye, is cytotoxic to human skin cells: studies in monolayer and 3D skin model using human keratinocytes (HaCaT) - Zanoni, Thalita B.; Tiago, Manoela; Faião-Flores, Fernanda; Barros, Silvia Berlanga de Moraes; Bast, Aalt; Hageman, Geja; Oliveira, Danielle Palma de; Maria-Engler, Silvya Stuchi (Toxicology Letters, 2014)