For instance, the MHC gene H2-k1 is positively associated with anxiety (r = 0.91, P = 0.03, Table 2), and H2-d1 and H2-k1 with exploratory activity (r = 0.81 ~ 0.91, P = 0.04 ~ 0.01, Table 2) of animals, based on the study by Fraser et al. (MPD #94) [41]. Here, HLA-C is linked to Anxiety.