Final answer:
The factor not affecting the window of implantation is 'histiotrophic nutrition'. This term is associated with the nourishment of the embryo after implantation, not the conditions that allow implantation to occur.
Step-by-step explanation:
The factor that does not affect the window of implantation is 'histiotrophic nutrition'. The window of implantation refers to a specific period during which the endometrium is receptive to embryo implantation. Factors that influence this include progesterone levels, which prepare the endometrial lining for implantation, and decidualization, the process where endometrial cells become specialized to support the developing embryo. Mucin 1 is also involved in the implantation process and can affect embryo adhesion to the endometrium. However, 'histiotrophic nutrition' relates to the sustenance the embryo receives from the endometrium after implantation has occurred, not the window of implantation itself.