19271
Na2S2O5 administration also markedly increased the number of apoptotic cells , cleaved caspase - 3 and PAR expression ( PARP activity indicator ) and , decreased Ki67 expression ( cell proliferation index ) in gastric mucosal cells .
 Chemical: Na2S2O5
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
 Chemical: Na2S2O5