Genetic interactions between syx genes and between syx-b and amot. (A) Phenotypic penetrance of amot, syx-a, and syx-b morphants. (B) Phenotypic severity of amot, syx-a, and syx-b morphants measured in terms of ISV defects per embryo. (C) Phenotypic penetrance of syx-b; amot double morphants and syx-a; syx-b double morphants. Phenotypic severity of syx-b; amot double morphants and syx-a; syx-b double morphants measured in terms of ISV defects per embryo. (D) Phenotypic severity of amot, syx-a, and syx-b morphants as well as for amot syx-b and syx-a/syx-b double morphants. Error bars indicate the standard deviation. *P < .05; ***P < .001.