Immunolabeling of E14.5 brain sections electroporated in utero with shTtyh1 alone or in combination with a shTtyh1-resistant Ttyh1 (Ttyh1res) expression vector at E13.5 using anti-GFP and Alexa Fluor 488-conjugated secondary antibodies. The DAPI nuclear counterstain is shown in blue. Scale bar: 100 μm. Quantification of (I) 