Fig. 1.

The results of the Y-maze tests. The alternation percentage was significantly lower in the db/db^−/− control group than that in the three WT groups (**, P<0.01, F = 7.330). The percentage of lower dose of EGb761 (50 mg/kg) had a rising trend compared with db/db^−/−-control group, which implied a better memory ability. Alternation percentage = actual alternation / maximum alternation. n = 8 for WT control, WT 50 mg, WT 100 mg and db/db^−/− control; n = 6 for db/db^−/− 50 mg; n = 7 for db/db^−/− 100 mg