A major QTL for QHCl taste on mouse chromosome 6. (Top panel) The interval map (see Methods) shows a significant QTL on chromosome 6 (green) and a suggestive QTL on chromosome 8 (yellow) affecting taste responses to 1 mM QHCl. (Bottom panel) For 3 mM QHCl, both QTL were suggestive (yellow). The dashed line indicates genome-wide significance.