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Vessel relaxation response to Ach in the presence or absence of L-NAME **P<0.01 vs. the control group; ##P<0.01 vs. the HHcy group. Ach, acetylcholine; L-NAME, N(ω)-nitro-L-arginine-methylester; HHcy, hyperhomocysteinemia; TEA, total extract of Astragalus membranaceus.
