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However , cytological assay using apoptotic and necrotic markers resulted in that apoptosis , but not necrosis , was significantly induced in Neuro - 2a cells when NaAsO ( 2 ) exposure continued after the significant effects of NaAsO ( 2 ) on neurite outgrowth were found by live imaging .
 Chemical: NaAsO ( 2 ); Chemical: NaAsO ( 2 )
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: NaAsO ( 2 ); Chemical: NaAsO ( 2 )