CRISPR/cas9 genome editing used a guide crRNA [GGAGGAACTCTTCGCACACT] to insert an internal ribosomal entry site (IRES)/citrine yellow fluorescent sequence into the 3' UTR of the gene. Gata3 transcript Gata3-201 (ENSMUST00000102976.4) was used as reference for for the exon number and guide sequences (J:307783)