5156
The serotonin ( 5 - HT ) receptors of type 6 ( 5 - HT6 ) are quite different from all other 5 - HT receptors , as they include a short third cytoplasmatic loop and a long C - terminal tail , and one intron located in the middle of the third cytoplasmatic loop .
 Chemical: serotonin; Chemical: 5 - HT; Chemical: 5 - HT; Chemical: C
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
 Chemical: serotonin; Chemical: 5 - HT; Chemical: 5 - HT; Chemical: C