The core histone fold: Limits to functional versatility Christos A. OuzounisNikos C. Kyrpides Correspondence Pages: 541 - 542
Prebiotic synthesis of diaminopyrimidine and thiocytosine Michael P. RobertsonMatthew LevyStanley L. Miller Articles Pages: 543 - 550
Molecular phylogeny of the free-living archezoanTrepomonas agilis and the nature of the first eukaryote T. Cavalier-SmithE. E. Chao Articles Pages: 551 - 562
The sequence and organization of the core histone H3 and H4 genes in the early branching amitochondriate protistTrichomonas vaginalis Alexandra MarinetsMiklós MüllerMichael Duchêne Articles Pages: 563 - 571
Thegag coding region of theDrosophila telomeric retrotransposon,HeT-A, has an internal frame shift and a length polymorphic region Mary-Lou PardueOlga N. DanilevskayaKimberly Erby Articles Pages: 572 - 583
Gypsy/Ty3-like elements in the genome of the terrestrial salamanderHydromantes (Amphibia, Urodela) Silvia MarracciRenata BatistoniIrma Nardi Articles Pages: 584 - 593
Scapharca inaequivalvis tetrameric hemoglobin A and B chains: cDNA sequencing and genomic organization Maria Cristina PiroAlessandra GambacurtaFranca Ascoli Articles Pages: 594 - 601
The promoter region of the carbamoyl-phosphate synthetase III gene ofSqualus acanthias Jin HongWilmar L. SaloPaul M. Anderson Articles Pages: 602 - 609
Determinants of rate variation in mammalian DNA sequence evolution Lindell BromhamAndrew RambautPaul H. Harvey Articles Pages: 610 - 621
Sequence and evolutionary history of the length polymorphism in intron 1 of the human red photopigment gene Madeleine J. MeagherA. Lund JorgensenSamir S. Deeb Articles Pages: 622 - 630
A comparison of the nucleotide sequences of theadk andrecA genes of pathogenic and commensalNeisseria species: Evidence for extensive interspecies recombination withinadk Edward FeilJiaji ZhouBrian G. Spratt Articles Pages: 631 - 640
Phylogenetic relationships within caniform carnivores based on analyses of the mitochondrial 12S rRNA gene Christina LedjeUlfur Arnason Articles Pages: 641 - 649
Pattern and timing of evolutionary divergences among hominoids based on analyses of complete mtDNAs Ulfur ArnasonAnette GullbergXiufeng Xu Articles Pages: 650 - 661
Parallel evolution in radiation ofOhomopterus ground beetles inferred from mitochondrial ND5 gene sequences Zhi-Hui SuOsamu TominagaSyozo Osawa Articles Pages: 662 - 671
Early evolutionary origin of the planktic foraminifera inferred from small subunit rDNA sequence comparisons Christopher M. WadeKate F. DarlingAndrew J. Leigh Brown Articles Pages: 672 - 677
Antibody-antigen recognition: A canonical structure paradigm Francisco Lara-OchoaJuan C. AlmagroMichael Conrad Articles Pages: 678 - 684
Integration of retroposable elements in mammals: Selection of target sites Jerzy JurkaPaul Klonowski Letter To The Editor Pages: 685 - 689