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Stem cell transplantation is now largely performed using blood stem cells from the patient. The type and appearance of these cells are identical to those found in bone marrow; however, there may be functional differences between the two. Dr. Michael Lill's research group has shown that blood stem cells grow more slowly than bone marrow stem cells, and this may effect the success of the transplant. Their studies have also shown that blood stem cells seem to be able to change into B-lymphocytes, as do bone marrow cells. Dr. Lill's research group is continuing to discover more differences and similarities between these cell sources.