7680
Until now , each of these loci was considered to contain three genes ( for regulator , permease and alpha - glucosidase ) , but a fourth gene , presumably an extra alpha - glucosidase gene , was found at MAL1 adjacent to the usual cluster of three genes .
 regulator, permease, alpha - glucosidase, alpha - glucosidase gene, MAL1
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: GENE 
Text: {0} 
Answer:
 regulator, permease, alpha - glucosidase, alpha - glucosidase gene, MAL1