CRISPR/cas9 endonuclease-mediated genome editing uses two guide RNAs [GTGCTGGGTGTTTGCAGCGGTGG and AGTGAAGTACGGGCAGTGCTGGG] to insert the cysteine to serine amino acid substitution in at residue 277 (exon 6). Tgm2 transcript Tgm2-201 was used as reference for the exon numbers and guide sequence (ENSMUSG00000037820). (J:337709)