1. Trentin, J. J. (1970) Influence of hematopoietic organ stroma (hemopoietic microenvironment) on stem cell differentiation, in Regulation of Hematopoiesis ( Gordon, A. S., ed.), Meredith, New York, pp. 161–186.
2. Wu, L. Antica, M., Johnson, G., Scollay, R., and Shortman, K. (1991) Developmental potential of the earliest precursor cells from the the adult mouse thymus. J. Exp. Med. 174 1617–1627.
3. Watson, J. D., Morrissey, P. J., Namen, A. E., Conlon, P. J., and Widmer, M. B. (1989) Effect of IL-7 on the growth of fetal thymocytes in culture. J. Immunol. 143, 1215–1222.
4. Miller, M. D. and Krangel, M. S. (1992) Biology and biochemistry of the chemokines: A family of chemotactic and inflammatory cytokines. Crit. Rev. Immunol. 12, 17–46.
5. Lorenzo, J. A. (1991) The role of cytokines in the regulation of local bone resorption. Crit. Rev. Immunol. 11, 195–213.