Barclay, A. N., Brown, M. H., Law, S. A. K. A., McKnight, A. J., Tomlinson, M. G., & van der Merwe, P. A. (1997). The leucocyte antigen factsbook. Academic Press.
Lindsten, T., Lee, K. P., Harris, E. S., Petryniak, B., Craighead, N., Reynolds, P. J., ... & Gray, G. S. (1993). Characterization of CTLA-4 structure and expression on human T cells. The Journal of Immunology, 151(7), 3489-3499.
Kuiper, H. M., Brouwer, M., Linsley, P. S., & Van Lier, R. A. (1995). Activated T cells can induce high levels of CTLA-4 expression on B cells. The Journal of Immunology, 155(4), 1776-1783.