Adrenalectomized female rhesus monkeys displayed diminished female sexual receptivity. This mechanism leads to similar immediacy, similarity, composure, and receptivity as in FtF communication. This signaling is important in regulating the timing of embryonic implantation and uterine receptivity. Researchers hypothesize that cycloprolylproline reduces female receptivity to further breeding. Night monkeys also send chemical signals through urine to communicate reproductive receptivity. Therefore, pregnancy rates can be improved by optimizing endometrial receptivity for implantation. Kant is silent about what this manifold of the original receptivity of sensibility is. Conversely, females have brief periods of sexual receptivity during the season. Calling signals sexual receptivity of the female and therefore affects mate choice. As the spathe wilts, the female flowers lose receptivity to pollination. The time of receptivity is the implantation window. Political opportunity refers to the receptivity or vulnerability of the existing political system to challenge. If females respond they advertise their receptivity. Female cuttlefish signal their receptivity to mating using a display called precopulatory grey. While Chokhmah is the fuel, pure energy, Binah is the engine, pure receptivity.