HTT and Huntington disease: We successfully used random lasing to discriminate among three cell profiles: non-transfected N2A cells, which were used as a control (NT), N2A cells transfected with a non-pathogenic form of Huntingtin (HTT-Q23), and N2A cells transfected with a pathogenic form of Huntingtin (HTT-Q74), which was used as a cell model of HD.