List of C. elegans twk genes and their expression in the motor circuit neurons based on the CeNGEN project (www.cengen.org).

Genes in red were expressed in the motor circuit and exhibited detectable effects on the motor behavior. Genes in blue were expressed in the motor circuit and did not obviously affect the motor behavior. Genes in bold black were previously studied but not analyzed in this study. Behaviors of loss-of-function mutants were considered here. twk-40 was not annotated to be obviously expressed in PVC neurons at CeNGEN. twk-3 was chosen as a presumptive negative control due to its lack of obvious expression in the motor circuit. The relative expression levels of twk genes (based on CeNGEN) in each neuronal type are qualitatively indicated with the numbers of asterisks: *, weak; **, moderate; ***, strong. (XLSX)