Transplanted hUCBS cells in the injured spinal cord, with anti-BrdU antibody as a primary antibody followed by the secondary antibody conjugated with FITC. The figure represents a qualitative feature of the immunostained cells (a). (b) Shows phase contrast of (a) picture. Note. hUCBS = human umbilical cord blood stem; BrdU = Br5-bromo-2′-deoxyuridine; FITC = fluorescein isothiocyanate.