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The antidepressant - like effects of this low dose of ketamine were completely abolished when female rats were ovariectomized ( OVX ) , and restored when physiological levels of estrogen and progesterone were supplemented , suggesting a critical role for gonadal hormones in enhancing the antidepressant - like effects of ketamine in female rats .
 Chemical: ketamine; Chemical: estrogen; Chemical: progesterone; Chemical: ketamine
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: ketamine; Chemical: estrogen; Chemical: progesterone; Chemical: ketamine