24341
Lastly , histological data showed that a loss of PD - 1 caused BDC2 . 5 cells to penetrate deep into the islet core , resulting in conversion from peri - insulitis to destructive insulitis .
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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