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. 2014 Jan 16;10(1):e1003878. doi: 10.1371/journal.ppat.1003878

Figure 9. Model of serotonin signaling mediated by Sm5HTR in S. mansoni.

Figure 9

Summary of mechanisms by which serotonin can stimulate worm movement. The results suggest that serotonin works through its Sm5HTR receptor to stimulate interneuronal and/or neuromuscular signaling, indirectly increasing contractility of the musculature. Serotonin may also have direct effects on the muscles but it is unclear if those effects are mediated by Sm5HTR or a different receptor. An additional mechanism by which serotonin may control movement is through modulation of sensory neuronal circuits, where Sm5HTR is abundantly expressed. These could play an important role in mediating locomotory responses to host-derived signals, for example chemotactic responses or other types of host-parasite interaction.