Complete genomic structure of the CLCN6 and CLCN7 putative chloride channel genes 1 GenBank accession numbers: AF009247–AF009257 (human CLCN6 exons 1–23), AF030101–AF030106 (mouse CLCN6 exons 1–23), AF063098–AF063101 (mouse CLCN7 exons 1