Fig. 3
From: The role and potential of umbilical cord blood in an era of new therapies: a review
Sedimentation of red blood cells (RBCs). Representative photographs show umbilical cord blood collections at the beginning (a) and at the end (b) of the process of RBC sedimentation. Note that a yellow modified buffy coat, enriched in mononuclear cells, is obtained at the top of the bag. This procedure is central to reduce volume sample, storage space, and the cytotoxicity caused by the thawing of RBCs