#$%^&*AU2013234396A120131017.pdf#####Abstract The present invention relates to the use of polysulfated polysaccharides in combination with progenitor cells to improve the viability of the progenitor cells including improving the cryopreservation of the progenitor cells and provides novel 5 compositions, methods and uses. The present invention also relates to the use of polysulfated polysaccharides to regulate the proliferation and differentiation of progenitor cells.