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Introgression of BN1 chromosome does not alter pain tolerance or shock reactivity. a FHH and FHH-1BN strains had similar responses to the shock UCS given during training, while the BN strain was significantly more reactive to the UCS after shock 4. b The FHH strain showed a higher pain tolerance on the Hotplate than the BN strain and this was not altered by the BN1 substitution. * denotes P < 0.05
