Barbas, C. F., Heine, A., Zhong, G., Hoffmann, T., Gramatikova, S., Björnestedt, R., List, B., Anderson, J., Stura, E. A.,
Wilson, I. A., & Lerner, R. A. (1997). Immune versus natural selection: Antibody
aldolases with enzymic rates but broader scope. Science Magazine, 278(5346),
2085-2092. doi:10.1126/science.278.5346.2085.