sentences:  In 2006, scientists in the lab of Shahragim Tajbakhsh presented evidence that muscle satellite cells, which are proposed to be adult stem cells of the skeletal muscle compartment, exhibited asymmetric segregation of BrdU-labelled DNA when put into culture.They also had evidence that demonstrated BrdU release kinetics consistent with an immortal DNA strand mechanism were operating "in vivo", using juvenile mice and mice with muscle regeneration induced by freezing.These experiments supporting the immortal strand hypothesis, however, are not conclusive.