4666
The toxicity of ABA was assessed by monitoring oxygen consumption and mitochondrial membrane potential , intracellular ATP concentration , cell viability , intracellular Ca ( 2 + ) homeostasis , release of cytochrome c , caspase 3 activity and necrotic cell death .
 Chemical: ABA; Chemical: oxygen; Chemical: ATP; Chemical: Ca ( 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: ABA; Chemical: oxygen; Chemical: ATP; Chemical: Ca ( 2 + )