1. Forthcoming papers

   Announcement Pages: iii - iii

2. Announcement

   Announcement Pages: 545 - 545

3. How long did it take for life to begin and evolve to cyanobacteria?

   • Antonio Lazcano
   • Stanley L. Miller

   OriginalPaper Pages: 546 - 554

4. Production of RNA by a polymerase protein encapsulated within phospholipid vesicles

   • Ajoy C. Chakrabarti
   • Ronald R. Breaker
   • David W. Deamer

   OriginalPaper Pages: 555 - 559

5. Transbilayer diffusion of divalent cations into liposomes mediated by lipidic particles of phosphatidate

   • Isabel Baeza
   • Carlos Wong
   • Carlos Argüello

   OriginalPaper Pages: 560 - 568

6. Contrasting rates of nucleotide substitution in the X-Linked and Y-Linked zinc finger genes

   • Lawrence C. Shimmin
   • Benny H.-J. Chang
   • Wen-Hsiung Li

   OriginalPaper Pages: 569 - 578

7. The Dictyostelium discoideum mitochondrial genome: A primordial system using the universal code and encoding hydrophilic proteins atypical of metazoan mitochondrial DNA

   • Robert A. Cole
   • Keith L. Williams

   OriginalPaper Pages: 579 - 588

8. Evolutionary analysis of cytochrome b sequences in some perciformes: Evidence for a slower rate of evolution than in mammals

   • P. Cantatore
   • M. Roberti
   • C. Saccone

   OriginalPaper Pages: 589 - 597

9. The mitochondrial ribosomal RNA genes of the nematodes Caenorhabditis elegans and Ascaris suum: Consensus secondary-structure models and conserved nucleotide sets for phylogenetic analysis

   • Ronald Okimoto
   • Jane L. Macfarlane
   • David R. Wolstenholme

   OriginalPaper Pages: 598 - 613

10. On hypervariability at the reactive center of proteolytic enzymes and their inhibitors

    • Tornoko Ohta

    OriginalPaper Pages: 614 - 619

11. Evolutionary role of abortive transcript as a primer for DNA replication

    • Joji Matsumoto

    OriginalPaper Pages: 620 - 624

12. Analysis of peptides from known proteins: Clusterization in sequence space

    • Victor B. Strelets
    • Ilya N. Shindyalov
    • Hwa A. Lim

    OriginalPaper Pages: 625 - 630

13. Tracing the spread of fibronectin type III domains in bacterial glycohydrolases

    • Elizabeth Little
    • Peer Bork
    • Russell F. Doolittle

    OriginalPaper Pages: 631 - 643

14. Evolution of the proteinase inhibitor I family and apparent lack of hypervariability in the proteinase contact loop

    • Lesley L. Beuning
    • Thomas W. Spriggs
    • John T. Christeller

    OriginalPaper Pages: 644 - 654

15. Amino acid sequence of the Homo sapiens brain 21-23-kDa protein (Neuropolypeptide h3), comparison with its counterparts from Rattus norvegicus and Bos taurus species, and expression of its mRNA in different tissues

    • Nadia Seddiqi
    • Francine Bollengier
    • Françoise Schoentgen

    OriginalPaper Pages: 655 - 660

16. Molecular pathways to parallel evolution: I. Gene nexuses and their morphological correlates

    • Emile Zuckerkandl

    Synthesis Pages: 661 - 678