Christian J. Stoeckert Jr1, Helen C. Causton2
& Catherine A. Ball31
Center for Bioinformatics and Department of Genetics, University of Pennsylvania, 423 Guardian Drive, Philadelphia, Pennsylvania 19104-6021, USA.
2
Clinical Sciences Centre/Imperial College Microarray Centre, Imperial College, Hammersmith Campus, Du Cane Road, London W12 ONN, UK.
3
Department of Genetics, Stanford University School of Medicine, 300 Pasteur Drive, Stanford, California 94305-5120, USA.
Correspondence should be addressed to Christian J. Stoeckert Jr stoeckert@pcbi.upenn.edu