ALPP is a membrane protein and exits as a homodimer. ALPP is expressed only in normal term placenta, endocervix and fallopian tube and also in ovarian and proximal gastrointestinal tumors. It has been shown to play a role in a number of processes including cell signaling, long-term potentiation, and cell adhesion, however, the best known and most commonly studied role is implicated in Alzheimer's research.Alternative Names: Alkaline phosphatase, placental type, also known as Alkaline phosphatase Regan isozyme, Placental alkaline phosphatase 1, ALPP and PLAP, belongs to the alkaline phosphatase family.