27517
We have investigated the effect of melatonin and its analogue 5 - methoxycarbonylamino - N - acetyltryptamine , 5 - MCA - NAT , on beta 2 / alpha 2A - adrenergic receptor mRNA as well as protein expression in cultured rabbit non - pigmented ciliary epithelial cells .
 Chemical: melatonin; Chemical: 5 - methoxycarbonylamino - N - acetyltryptamine; Chemical: 5 - MCA - NAT
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: melatonin; Chemical: 5 - methoxycarbonylamino - N - acetyltryptamine; Chemical: 5 - MCA - NAT