"Scientists point out that many puzzles about the TB bacteria remain unanswered. ???We don???t know how TB bacteria gets into or gets out of these cells,??? said Dean Felsher, professor of medicine-oncology at Stanford and a co-author of the study. ???Immune cells can go throughout the body including the bone marrow, but we think they cannot as easily find TB that is in bone marrow stem cells.???" . . . .