TABLE 1.
Euryarchaeota and Crenarchaeota box C/D sRNA spacing between the box C/D and C′/D′ RNA motifs
| Archaeal species | Box C/D sRNAs | Average D spacer length (nt) | Average D′ spacer length (nt) |
| Euryarchaeota | |||
| P. horikoshii | 54 | 12.6 ± 1.4 | 12.3 ± 0.7 |
| P. furiosis | 55 | 12.7 ± 1.3 | 12.3 ± 0.9 |
| P. abyssi | 59 | 12.7 ± 1.7 | 12.3 ± 0.9 |
| A. fulgidus | 4 | 11.5 ± 1.0 | 11.5 ± 1.0 |
| M. jannaschii | 8 | 12.6 ± 1.2 | 12.0 ± 0.5 |
| Crenarchaeota | |||
| S. solfactaricus | 13 | 13.3 ± 2.0 | 11.5 ± 0.7 |
| S. acidocaldarius | 29 | 13.2 ± 2.3 | 12.3 ± 1.3 |
| A. pernix | 23 | 13.1 ± 2.2 | 13.0 ± 3.0 |
| Total | 245 | 12.8 ± 1.6 | 12.3 ± 1.1 |
Box C/D sRNA sequences were obtained from the Eddy snoRNA database (http://rna.wustl.edu/snoRNAdb/). Spacer lengths are reported as the average plus or minus the standard deviation for the D or D′ spacer of each archael species analyzed.