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Endothelium-dependent relaxation in response to Ach. **P<0.01 vs. the control group; ##P<0.01 vs. the HHcy group. Ach, acetylcholine; HHcy, hyperhomocysteinemia; TEA, total extract of Astragalus membranaceus; ASP, Astragalus saponins; APS, Astragalus polysaccharides; ATF, Astragalus total flavonoids.
