Figure 5: The mean thickness of the granular layer on treatment with PE. The one-way analysis of variance (ANOVA) test was used. The Fisher's least significant difference (LSD) t-test was applied when equal variance could be assumed. Data are presented as means±SD. *significantly different from the control, AD+PE, AD+EA at P≤0.05. #significantly different from AD group at P≤0.05.