Effect of thymoquinone on PI3K/Akt protein expression in SCI rats. (A and B) Relative PI3K and p-Akt/Akt protein expression was analyzed by (C) western blotting in SCI rats. ##P<0.01 vs. Sham; **P<0.01 vs. Model. SCI, spinal cord injury; Sham, sham surgery group; Model, SCI surgery group; Thymoquinone, SCI + thymoquinone group; PI3K, phosphoinositide 3-kinase.