| Comparison of regulatory and structural regions of genes of tryptophan metabolism | C Yanofsky | 143 |
| Selective neutrality of glucose-6-phosphate dehydrogenase allozymes in Escherichia coli | DE Dykhuizen, J de Framond, DL Hartl | 162 |
| Directed evolution of cellobiose utilization in Escherichia coli K12 | M Kricker, BG Hall | 171 |
| Major morphological effects of a regulatory gene: Pgm1-t in rainbow trout | RF Leary, FW Allendorf, KL Knudsen | 183 |
| Concerted evolution of the immunoglobulin VH gene family | T Gojobori, M Nei | 195 |
| Retention of cryptic genes in microbial populations | WH Li | 213 |