- The tal gene undergoes chromosome translocation in T cell leukemia and potentially encodes a helix-loop-helix protein. Chen, Q., Cheng, J.T., Tasi, L.H., Schneider, N., Buchanan, G., Carroll, A., Crist, W., Ozanne, B., Siciliano, M.J., Baer, R. EMBO J. (1990)