Shows considerable resistance to halothane, and saccadic walking behaviour reflected in a poor geotaxis response. Shows appreciable resistance to trichloroethylene-induced anesthesia. Response to enflurane and isoflurane is indistinguishable from wild type.
Alleles of na form a phenotypic series, going from strongest to weakest: nahar38 > nahar85 > naP890 > na1 > naPex1 > naPex2.