321
In 1981 , Moro and his collaborators found that intravitreal injection of 5 , 6 - dihydroxytryptamine , a serotonergic neurotoxin , causes miosis [ 91 ] .
 None
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Anatomy 
Text: {0} 
Answer:
 None