681
The subunit protein of curli was highly homologous at its amino terminus to SEF - 17 , the subunit protein of thin , aggregative fimbriae of Salmonella enteritidis 27655 strain 3b , suggesting that these fibres form a novel class of surface organelles on enterobacteria .
 curli, SEF - 17
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: GENE 
Text: {0} 
Answer:
 curli, SEF - 17