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Fig. 2 Generation of chd2 mutation in zebrafish by CRISPR/Cas9 gene editing and protein function comparison of two chd2?knockout zebrafish strains. a Structure of zebrafish chd2 gene and protein from https://www.uniprot.org/uniprot/A0A0R4IR86. b The CRISPR/Cas9-induced mutations in chd2 in fdu901 and fdu902 are shown in protein structure. c Exon 2 is the target for CRISPR/Cas9 gene editing in zebrafish chd2 in fdu901. The CRISPR/Cas9-induced mutation (4-base deletion) in chd2 is shown in annotated chd2 mutant sequences. ?-? are deleted nucleotides. d Exon13 is the target for CRISPR/Cas9 gene editing in zebrafish chd2 in fdu902. The CRISPR/Cas9-induced mutation (1-base deletion) in chd2 is shown in annotated chd2 mutant sequences. ?-? are deleted nucleotide