Intermittent PTH stimulates periosteal bone formation by actions on post-mitotic preosteoblasts.
Jilka RL, O'Brien CA, Ali AA, Roberson PK, Weinstein RS, Manolagas SC. Intermittent PTH stimulates periosteal bone formation by actions on post-mitotic preosteoblasts. Bone. 2009 Feb; 44(2):275-86.