Fig. 2.  Acquisition of memory during the training phase of the fear-conditioning protocol is similar in C57BL/6-WT (n = 55) and Hsp72-Tg mice (n = 45). Both mouse strains achieved maximal performance by the sixth training session. No differences in establishment of long-term memory were found between C57BL/6-WT and Hsp72-Tg mice. Values are mean ± SEM. Hsp72-Tg = heat shock protein 72 transgenic; WT = wild-type C57BL6.