5-hydroxytryptamine
ᴛᴡɪᴛᴛᴇʀ : 156ᴄʜᴀɴᴏᴍʙᴏʙᴀ | ᴡᴇʟᴄᴏᴍᴇ ᴛᴏ ᴍʏ ᴡᴏʀʟᴅ ;) | 5-HT