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Effect of bisphenol A (BPA), and Naringin (NG) on step-down latency (SDL) acquisition and retention. Animals were trained on each day prior to assessment of cognition. Animals were tested after 60 min for acquisition and after 24 h for retention of memory. A: SDL acquisition; B: SDL retention. Each value was presented as mean ± SEM (n = 8). **: P <0 .001 when compared with normal control group; ##: P < 0 .001 as compared to BPA only group
