Genomic Organization, Nucleotide Sequence, Biophysical Properties, and Localization of the Voltage-Gated K+ Channel Gene KCNA4/Kv1.4 to Mouse Chromosome 2/Human 11p14 and Mapping of KCNC1/Kv3.1 to Mouse 7/Human 11p14.3-p15.2 and KCNA1/Kv1.1 to Human 12p13