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Avicine ( CTP-37 ) is a peptide fragment of Human chorionic gonadotropin ( hCG ) , an oncofoetal protein expressed by most cancer lines , the significant role of hCG being to ward off the immune system , the same way cells of the developing foetus ward off the immune system .
 None
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: location, person, organization 
Text: {0} 
 Entities:  
Answer:
 None