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(a) Effects of paeoniflorin and neostigmine on the contractile amplitude of jejunal muscle from healthy rats in vitro. (b) Neostigmine can increase the contractile amplitude of jejunal muscle in vitro, but this change can be reversed by paeoniflorin. N: neostigmine; P: paeoniflorin. ∗∗p < 0.01, compared with preadministration; ##p < 0.01, compared with N.
