May be involved in the onset of endometrial receptivity for implantation/sensitization for the decidual cell reaction Enhances Wnt signaling and inhibits TGF-beta signaling (By similarity). Directly antagonizes activity of BMP2, BMP4, BMP6 and BMP7 in a dose-dependent manner. . This is the function of Ensembl gene identifier ENSG00000171243 (SOSTDC1, sclerostin domain containing 1).