A significant (LRS > 20.5; genome-wide p = 0.05) QTL for sensitivity to 1 mM QHCl was indicated on chromosome 6, with a second, suggestive (LRS > 11.4; genome-wide p = 0.65) QTL on chromosome 8 (Figure 2A); at 3 mM QHCl, both of these QTL were suggestive (LRS > 10.9) but did not reach genome-wide significance (Figure 2B).