6701
In experiment 1 , 152 ovariectomized nulliparous ( n = 77 ; no reproductive experience ) and primiparous ( n = 74 ; having had and raised one litter of pups ) Wistar rats were trained on an ambiguous t - maze task and tested for memory system bias .
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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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