Up to cap stage, bell stage and tooth tissue secretory stage, the expression of OPN was wider and more extensive than that of BSP. Especially during tooth tissue secretory stage, OPN was strongly positive in all tooth germ cells and bones.

• 在帽状期、钟状期及牙体硬组织(牙冠、牙根)分泌形成期,OPN的表达范围及强度高于BSP,尤其在牙体硬组织形成期,OPN在牙胚各类细胞及骨组织中均呈强阳性表达。