This journal provides immediate access to some articles. Volume 356(1410); June 29, 2001 Memorial to Bill Hamilton. PMCID: PMC1088466 Using human immunodeficiency virus type 1 sequences to infer historical features of the acquired immune deficiency syndrome epidemic and human immunodeficiency virus evolution. PMCID: PMC1088479 Concerning the early and current spread of human immunodeficiency virus type 1 and the scientific burden of proof versus the burden of current human immunodeficiency virus incidence. PMCID: PMC1088488 | ||