highly significantp<0.0001
In addition to the previously reported QTLs on chromosome 16 (p<0.0001; 8), we found two highly significant QTLs (p<0.0001; Table 1 ; Fig. 1 ) on chromosome 5, one significant QTL on chromosome 2, (p<0.0001; Table 1 ; Fig. 1 ) and one suggestive QTL on chromosome 17 for USI trait (p<0.001; Table 1 ).