none3Human infertility is an important social problem, particularly stressed in the recent years, and intensive research is being done in the field of therapies such as Assisted Reproduction Technologies (ART) to cope with it in the most difficult situations. The success of ART depends on several important contributing factors: the success in ovarian stimulation, fertilization and embryo implantation. This last step is the most frustrating one, failing in most transfer of embryos in uterus. Together with real evaluation of oocyte and embryo inner quality one of the most relevant aspects of ART and reproduction in general is, consequently, the assessment of endometrial development and receptivity for embryo implantation, in order to predict ...