26787
Moreover , knockdown of PARP - 1 , another important protein in the response of hypoxia , attenuated the overexpression of HIF - 1 alpha and reduced the cell death rate .
 None
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
 Entities:  
Answer:
 None