Mitral and tufted cell-specific enhancer (MCE) directs transgene expression in mitral and tufted cells. (A1-A3) MCE-gV transgenic mouse line #1 (A1-A3), line #5 (B1-B3) and founder #3 (C1-C7). (A1, B1, C1) gapVenus fluorescence of whole-mount brains viewed from ventral side. (A2, B2) Parasagittal brain sections of MCE-gV lines #1 (A2) and #5 (B2) labelled with anti-green fluorescent protein (GFP) antibody. (A3, B3) Magnified views of the olfactory bulb. (C2-C7) Coronal sections of MCE-gV founder #3 labelled with anti-GFP antibody. In these three MCE-gV transgenic lines, gapVenus expression is detected in the mitral and tufted cells.