This allele is the result of a spontaneous missense mutation of a C to A change at position 613 (c.613C>A) producing a glutamine to lysine exchange at amino acid 205 (p.Q205K) but reported as p.Q177K in the extracellular Beta8-Beta9 loop of the alpha1 subunit. This spontaneous mutation arose in the animal colony of Christopher Paige in a mixed 129 and C57BL/6 strain. (J:248717)