May play a role in the cell attachment process. Present in stromal osteogenic cells. Expressed at much higher level in stromal osteogenic cells at low density compared to cells grown at higher densities (at protein level). Highly expressed in lung and placenta. Also expressed in bone and periosteum, but not in cartilage and skeletal muscle. Weakly or not expressed in other tissues. Expressed from 11 dpc to 17 dpc in embryos.