Comparison of CT segments in fresh or thawed CBUs. (A) Samples taken from fresh CBUs before cryopreservation between July 2007 and August 2009 were assayed for ALDH^br and compared with the results of the CT assay of segments from those units. N = 596. Red line indicates theoretical equality. (B) Research CBUs stored at the CCBB were selected. The bags were thawed with the segments and tested for ALDH^br. N = 60. Red line indicates theoretical equality.