Transfection Efficiency
exo utero electroporation was performed for E12.5 embryos, whereas in utero electroporation was performed at E13.5 and E15.5. Survival and EYFP+ rates (percentages) were calculated for every litter from the number of surviving embryos/operated and EYFP-positive/surviving embryos, respectively. The data are represented as mean ± SEM.