Description:WT female mouse and homozygous male mouse containing the Traffic Light Reporter 2 (TLR2) reporter at the Rosa26 locus were mated. Females were super-ovulated and zygotes harvested. Zyotes were electroporated with Cas9 RNP along with test guides and were cultured 96 hours to blastocyst stage. Blastocysts were imaged for tagRFP fluorescence and scored for fluorescence signal. Blastocysts were then PCR amplified for the reporter allele and Sanger sequenced. ICE analysis tool from Synthego was used to score edits. NOTE: Total blasts analyzed expressing the fluorescent reporter, 55-67. Total blast analyzed by Sanger sequencing, 55-67.