| ecolik12 | E. coli K-12 codon bias and tRNA numbers |
| get.s | Correlation between tAI and Nc adjusted |
| get.tai | The tRNA adaptation index |
| get.ws | Relative adaptiveness values |
| nc.adj | Adjusted effective number of codons (Nc) |
| nc.f | Nc vs. GC3s |
| ts.test | Monte Carlo test of correlation between tAI and Nc adjusted |