4806
Altogether our data indicate that PEDF belongs to the subgroup of noninhibitory serpins and that its N - terminal region confers a neurite - promoting activity to the protein .
 PEDF, serpins
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: GENE 
Text: {0} 
Answer:
 PEDF, serpins