15876
In further study using BEAS - 2B cells originated from the lung , the protein amount from cells exposed to 2HTO decreased more clearly although the generation of reactive oxygen species ( ROS ) was less compared to 1HTO and 3HTO .
 Chemical: oxygen
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: oxygen