Advances in understanding the evolution of HIV.

© Lippincott Williams & Wilkins S1 From the aDepartment of Zoology, Brigham Young University, Provo, Utah, USA and bSAIC Frederick, Frederick Cancer Research & Development Center, National Cancer Institute, Frederick, Maryland, USA. Sponsorship: This work was supported by a James A. Shannon Award, an Alfred P. Sloan Award, and NIH grant #R01 HD34350-01A1. Correspondence to Dr Keith A. Crandall, 574 Widtsoe Building, Department of Zoology, Brigham Young University, Provo, UT 84602-5255, USA. Tel: +1 801 378 3495; fax: +1 801 378 7423; e-mail: kac@email.byu.edu Advances in understanding the evolution of HIV