Table 2. Bias in tDNA type specificity among integrase tribes.
| tDNA | Average no. genesa | No. tribes | Bias ratiob | Pbiasc |
|---|---|---|---|---|
| Ala | 4.86 | 0 | <0.08 | 0.0021 |
| Arg | 6.70 | 14 | 1.71 | 0.033 |
| Asn | 2.65 | 2 | 0.62 | >0.1 |
| Asp | 2.83 | 0 | <0.14 | 0.029 |
| Cys | 1.28 | 2 | 1.27 | >0.1 |
| Gln | 2.83 | 2 | 0.58 | >0.1 |
| Glu | 3.62 | 1 | 0.23 | 0.060 |
| Gly | 5.58 | 7 | 1.02 | >0.1 |
| His | 1.28 | 1 | 0.64 | >0.1 |
| Ile | 3.99 | 6 | 1.23 | >0.1 |
| Leu | 6.94 | 10 | 1.18 | >0.1 |
| Lys | 3.46 | 4 | 0.94 | >0.1 |
| Met | 1.96 | 1 | 0.42 | >0.1 |
| Phe | 1.78 | 4 | 1.83 | >0.1 |
| Pro | 3.17 | 4 | 1.03 | >0.1 |
| Ser | 4.63 | 12 | 2.12 | 0.011 |
| Thr | 3.94 | 5 | 1.04 | >0.1 |
| Trp | 1.29 | 0 | <0.32 | >0.1 |
| Tyr | 1.95 | 1 | 0.42 | >0.1 |
| Val | 4.44 | 2 | 0.37 | 0.086 |
| Init | 2.69 | 1 | 0.30 | >0.1 |
| SeC | 0.23 | 1 | 3.61 | >0.1 |
| tmRNA | 1.00 | 9 | 7.35 | 0.0000042 |
| Undetd | 0.41 | 0 | <1.01 | >0.1 |
| Total | 73.51 | 89 |
aAverage per host strain, calculated as follows: for each island within a tribe, tDNA types were counted for the host genome, and counts were averaged with weighting according to the summed within-tribe distance scores for the integrase; these values were then averaged for the 89 tribes.
bBias ratio = No. tribes × Total genes/No. genes/Total tribes.
cThe probability that the observed bias would occur by random assortment, calculated from the binomial distribution.
dAnticodon stem–loop distortion renders type undeterminable; probable pseudogenes.