| Nomenclature Committee for the International Union of Biochemistry (NCIUB). Nomenclature for incompletely specified bases in nucleic acid sequences. Recommendations 1984 | | 99 |
| An analysis of replacement and synonymous changes in the rodent L1 repeat family | SC Hardies, SL Martin, CF Voliva, CA Hutchison, MH Edgell | 109 |
| Evolutionary implication of heterogeneity of the nontranscribed spacer region of ribosomal DNA repeating units in various subspecies of Mus musculus | H Suzuki, N Miyashita, K Moriwaki, R Kominami, M Muramatsu | 126 |
| Natural selection and the molecular clock | JH Gillespie | 138 |
| Relative contributions of germline gene variation and somatic mutation to immunoglobulin diversity in the mouse | T Gojobori, M Nei | 156 |
| Variation in the number of alpha-globin loci in sheep | A Rando, L Ramunno, P Masina | 168 |
| Book review | TS Whittam | 177 |
