Plays essential roles in both eye and limb development. Probable regulator of osteoblast differentiation. {ECO:0000269|PubMed:20359165, ECO:0000269|PubMed:21194678, ECO:0000269|PubMed:21194680}. This is the function of SMOC1 (SPARC related modular calcium binding 1, ENSG00000198732).