23973
Perinatal events can reprogram the hypothalamo - pituitary - adrenal axis for the entire lifespan leading to abnormal glucocorticoid stress - response ( GSR ) in adulthood : a phenomenon reported to be mediated by changes in DNA methylation of the glucocorticoid receptor ( GR ) gene promoter .
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Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Chemical 
Text: {0} 
Answer:
 None