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Depiction of determined differences in 5-HT7 receptor utilization between veins and arteries or veins without a functional 5-HT7 receptor. 7 = 5-HT7 receptor; 2A = 5-HT2A receptor. The thickness of the arrows denotes the higher affinity 5-HT has for the 5-HT7 vs 5-HT2A receptor. The 5-HT7 receptor is depicted in shadow on the arterial diagram given the lack of evidence of expression and function of this receptor.
