1. Darrieussecq, M. Pig Tales (Faber, London, 1997).
2. Dorling, A., Riesbeck, K., Warrens, A. & Lechler, R. Lancet 349, 867–871 (1997).
3. Vaughan, H., Loveland, B. & Sandrin M. Transplantation 58, 879–882 (1994)
4. McMorrow, I., Comrack, C., Sachs, D. & DerSimonian, H. Transplantation 64, 501–510 (1997).
5. White, D. Trends Biotechnol. 14, 3–5 (1996).