25
However , the 4b4a / 4a4a genotypes and the 4a allele for the VNTR polymorphism in intron 4 were more common in GR , compared with PR patients with clinical ED .
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Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
 None