1. Ohno, S. Evolution by Gene Duplication (George Allen and Unwin, London, 1970).
2. Hughes, A. L. The evolution of functionally novel proteins after gene duplication. Proc. R. Soc. Lond. B 256, 119–124 (1994).
3. Kaback, D. B. Yeast genome structure.In The Yeasts Vol. 6(eds Wheals, A. E., Rose, A. H. & Harrison, J. S.) 179–222 (Academic, London, 1995).
4. Olson, M. V. in The Molecular and Cellular Biology of the Yeast Saccharomyces Vol. 1(eds Broach, J. R., Pringle, J. R. & Jones, E. W.) 1–40 (Cold Spring Harbor Laboratory Press, NY, 1991).
5. Smith, M. M. Molecular evolution of the Saccharomyces cerevisiae histone gene loci. J. Mol. Evol. 24, 252–259 (1987).