Preclinical transplantation and safety of HS/PCs expanded from human umbilical cord blood

Figure 2 The determination of exogenous virus and stem cell factor residual in hematopoietic/progenitor stem cell product. A: The cellular morphology of human fibroblasts cultured in α-MEM (× 400); B: The cellular morphology of human fibroblasts cultured in α-MEM with the cell suspension of hematopoietic/progenitor stem cell (HS/PC) product (× 400); C: The standard curve of residual stem cell factor (SCF) in the HS/PC product. It was detected by ELISA. After a curve (dotted line) was constructed by plotting the mean absorbance against the concentration, a best fitting curve (solid line) through the points on the graph was drawn.