8617
The hippocampus is comprised of two distinct subfields that show different responses to hypoxic - ischemic brain injury : the CA1 region is particularly susceptible whereas the dentate gyrus ( DG ) is quite resistant .
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Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
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