Complementation tests between NMF310 and Clcn1adr-mto were conducted. The results of heterozygous x heterozygous matings (NMF310 x BALB/cByj-Clcn1adr-mto2J), i.e. 6 affected mice in a total of 29 progeny, suggest that NMF310 represents an allele of Clcn1.