Immunofluorescent staining of human embryonic kidney cell line 293 by ab64721 (1:500). Hek293 expresses many neuronal proteins. The red channel shows staining with ab64721, which recognizes all of these 293 cells. The green channels shows staining for another neuronal marker with a monoclonal antibody to ubiquitin C-terminal hydrolase 1 (UCHL1), ab64722. This neuronal gene is apparently activated in a cell density dependent fashion and at this stage only a few cells express this protein. However all cells that express NSE also express UCHL1.