A method of enriching mesenchymal precursor sells including the step of
enriching for cells based on at least two markers. The markers may be
either i) the presence of markers specific for mesenchymal precursor
cells, ii) the absence of markers specific for differentiated mesenchymal
cells, or iii) expression levels of markers specific for mesenchymal
precursor cells. The method may include a first solid phase sorting step
utilizing MACS recognizing expression of the antigen to the STRO-1 Mab,
followed by a second sorting step utilizing two color FACS to screen for
the presence of high level STRO-1 antigen expression as well as the
expression of VCAM-1.