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“S1P on its own did not relax or contract HCC strips, but on the other hand, incubation with S1P (0.1 μM) caused a 6-fold increase in relaxation induced by a subliminal dose of acetylcholine.”
Journal of Pharmacology and Experimental Therapeutics • 2006 | View Paper
“However, in the presence of S1P (10(-6) M), the BSM contractions induced by acetylcholine (ACh) and endothelin-1 (ET-1) were significantly augmented: both the ACh and ET-1 concentration-response curves were significantly shifted to the left.”