…on cells of the CA1 subregion (Barnes et al., 1997; Shen et al., 1997; McEchron et al., 2001; Rosenzweig et al., 2003) or have combined the data obtained from the CA1 and CA3 subregions for analytical purposes (Tanila et al., 1997a; Oler and Markus, 2000; Wilson et al., 2003, 2004, 2005).