Extended Table 1

We provided a table showing the number of variable positions for rRNA sequences of diverse taxonomic groups, along with the estimated alpha parameter of these sequences. The observed inhomogeneity was not due to a sampling effect, as showed by the following table, where the same parameters have been computed for all available sequences.
 

Group VP1 VP2 Alpha1 Alpha2
Mycetozoa 280 296 0.79 0.59
Choanoflagellates
60
89
0.14
0.29
Bilateria
93
241
0.12
0.26
Diploblasts
60
166
0.19
0.20
Chlorobionta
42
209
0.10
0.63
Euryotes
254
362
0.63
0.46
Crenotes
199
311
0.55
0.44
Fungi
56
254
0.30
0.30
Rhodobionta
78
197
0.19
0.26
Ciliates
89
242
0.15
0.41
Stramenopiles
55
190
0.10
0.19
Filose amoeba
84
184
0.20
0.69
Euglenozoa
332
349
1.41
1.19
Apicomplexa
57
202
0.37
0.58
Trichomonads
174
231
2.37
0.31
Diplomonads
388
446
1.22
1.09
Haptophyta
36
49
0.003
0.07
Microsporidia
373
509
1.20
0.82
Percolozoa
270
276
99
99
When using all available sequences, the number of variable positions obviously increases, but the estimated alpha parameters are not more homogeneous. As a matter of fact, the correlation coefficient between Alpha1 and Alpha2 is R=0.48, showing that the sampling bias is not responsible for the observed discrepancies.

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