Assertion: serotonin | /r/HasProperty | figure 1
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text: Serotonin (Figure 1) is mostly found outside the central nervous system ; it was first identified in enterochromaffin cells and named as “enteramine” by Vialli and Erspamer in 1937 and confirmed to be the same entity with the “clotted blood” vasoconstriction effects in 1952 .