Serine codon 533 (TCA) was targeted with an sgRNA (targeting CTCTGGAGGCAGGAATCAAT) and ssODN templates using CRISPR/Cas9 technology, changing it to aspartic acid codon GAT (p.S533D). This mutation creates a phosphomimetic residue at this position. Western blot experiments confirmed the expression of peptides from this allele. (J:294930)