The molecular repertoire of the mid-secretory phase human uterine fluid, when compared with that of the proliferative phase uterine fluid, is broadened due to differential expression of proteins. Further, some of the mid-secretory phase proteins were conserved across species.

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Our data suggest that endometrial reticuloplasmins are regulated by hormones and embryonic stimuli in a cell-type specific manner. These novel data open up new lines of investigation for elucidating the mechanisms by which hormones or embryonic stimuli influence the sub-cellular physiology of endometrium.