Assertion: feline estrus | /r/HasProperty | hormonally-mediated state
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text: Although feline estrus (the "female cat in heat" stage) is a hormonally-mediated state, influenced and driven primarily by increases in the blood levels of certain sex hormones (estrogen being the most important), it is primarily recognised and defined on the basis of the animal's behavioral signs (sex behaviors) not on the basis of hormonal measurements.