24562
Culture supernatants of Porphyromonas gingivalis ( P . g . ) , a bacterium that secretes proteases responsible for periodontitis , cleaved the MUC2 - C terminal region , whereas the N - terminal region was unaffected .
 N
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Chemical 
Text: {0} 
Answer:
 N