string: …et al. 2001; Cabib et al. 2002; Ventura et al. 2004a; McNamara et al. 2006; D'Este et al. 2007), indicating lower dopamine release in the NAcc and a lower behavioral response to psychostimulants in the DBA rather than the C57mice (Zocchi et al. 1998; Ventura et al. 2004a; b; Orsini et al. 2005).