1. Y. Chen, C.-F. Chen, D. J. Riley, P.-L. Chen, W.-H. Lee, Center for Molecular Medicine/Institute of Biotechnology, University of Texas Health Science Center at San Antonio, San Antonio, TX 78245, USA.
2. D. C. Allred, Department of Pathology, University of Texas Health Science Center at San Antonio, San Antonio, TX 78284, USA.
3. D. Von Hoff and C. K. Osborne, Division of Medical Oncology, Department of Medicine, University of Texas Health Science Center at San Antonio, San Antonio, TX 78284, USA.