| Individual and evolutionary variation of primate ribosomal DNA transcription initiation regions | GN Wilson, M Knoller, LL Szura, RD Schmickel | 221 |
| Silencing of duplicate genes: a null allele polymorphism for lactate dehydrogenase in brown trout (Salmo trutta) | FW Allendorf, G Stahl, N Ryman | 238 |
| Calibrating the molecular clock: estimates of ground squirrel divergence made using fossil and geological time markers | DG Smith, RG Coss | 249 |
| The relationship between codon boundaries and multiple reading-frame preferences: coding organization of bacterial insertion sequences | DJ Galas, TF Smith | 260 |
| Estimation of evolutionary distance between nucleotide sequences | F Tajima, M Nei | 269 |
| Book Reviews | A Chakravarti, FJ Ayala, LR Maxson | 286 |
