Superficially wild-type. CRISPR/Cas9 STOP-IN null mutant of C56G2.15. Universal 43bp-long knock-in insertion with 3-frame stop codon (STOP-IN cassette). left flanking sequence: CTCGTGAGCATTCACAGAAAAAATCATGCCGTCA; right flanking sequence: GTCCCCTCCAATGTCGTTTTTGTTGCTCAATAAGG; inserted sequence between the two flanking sequence (STOP-IN cassette): GGGAAGTTTGTCCAGAGCAGAGGTGACTAAGTGATAAgctagc Reference: Wang H, et al. G3 (Bethesda).