title: On bone-forming cells and blood vessels in bone development.
abstract: Replacement of nonvascular cartilage by bone and bone marrow is a critical step in bone development. In a recent issue of Developmental Cell, Maes et al. (2010) report that a distinct population of immature precursors of bone-forming cells migrate into the cartilage in intimate association with invading blood vessels.
authors.affiliation: Harvard School of Dental Medicine, 188 Longwood Avenue, Boston, MA 02115, USA.
authors.forename: Claire
authors.initials: C
authors.lastname: Clarkin
authors.affiliation: Harvard School of Dental Medicine, 188 Longwood Avenue, Boston, MA 02115, USA. Electronic address: bjorn_olsen@hms.harvard.edu.
authors.forename: Bjorn R
authors.initials: BR
authors.lastname: Olsen