Effects of total saponins from Sanguisorba officinalis on promoting hematopoietic cell proliferation Effect of APS on recoverable ability from cryopreservation damage of UCB hematopoietic cells Effects of total saponins from Sanguisorba officinalis on promoting hematopoietic cell proliferation Experimental research of Shuanghuang Shengbai granule on hematopoietic cells of leucopenia model mice Effect of total saponins from Sanguisorba officinalis on megakaryocyte progenitor cells proliferation, differentiation and relative receptor expression