IMMUNOLOGY:
Thoracic Thymus, Exclusive No Longer
Harald von Boehmer
T cell production in mice occurs in the chest thymus. A similar second thymus in the neck has now been shown to also make T cells, raising questions about earlier experiments.
The author is at Harvard Medical School, Dana-Farber Cancer Institute, 44 Binney Street, Boston, MA 02115, USA. E-mail: harald_von_boehmer{at}dfci.harvard.edu