Table 1.
List of common clusters containing genes for archaea-unique ribosomal proteins. The nonuniversal archaeal ribosome proteins (in bold) are shown in their most common genomic contexts. The numbers of crenarchaeota (Max = 7) and euryarchaeota (19) containing the particular arrangement are shown along with the total % of organisms containing that version. If the cluster did not completely meet our criteria (L14e, L7ae, and S6e), it is listed as uncertain. In two cases (L14e and L34e; S24e and S27ae), alternative but similar arrangements are shown. Gene/Protein names inside parentheses are not always present in the cluster and hence do not form the core of the cluster.
| Gene cluster | Number of | Number of | % that | Typical cluster arrangement |
| crenarchaeota | euryarchaeota | agree | ||
| L14e, L34e | 3 | 6 | 34.6 | Uncertain: L34e-cytidylate kinase-L14e |
| L14e | 4 | 0 | 15.3 | Alternative: L14e-truB in some Crenarchaeota |
| L15e | 5 | 10 | 57.6 | L15e-COG1325-COG1603 |
| L18e | 7 | 19 | 100 | L18e-L13-S9-rpoN |
| L19e, L32e, S4e | 6 | 18 | 92.3 | L14-L24-S4e-L5-S14-S8-L6-L32e-L19e-L18-S5-L30-L15-secY |
| L21e | 6 | 17 | 88.4 | (COG1258)-L21e-rpoF-COG1491 |
| L24, L7ae, S28e | 3 | 18 | 80.7 | ( L7ae)-S28e-L24e-(ndK)-(eIF2) |
| L30e | 7 | 13 | 76.9 | rpoH-rpoB2-rpoB1-rpoA1-rpoA2-L30e-NusA |
| L31e, L39, LXae | 4 | 11 | 57.6 | L39e-L31e-LXa-eIF6 |
| L37ae | 5 | 8 | 50 | L37ae-(rpoP)-COG2136 |
| L37e | 4 | 15 | 73 | snRNP-L37e |
| L44e, S27e | 6 | 15 | 80.7 | L44e-S27e-eIF2_α |
| S6e | 4 | 8 | 46.1 | Uncertain: S6e-eIF2_γ |
| S19e | 7 | 16 | 88.4 | S19e-COG2118, usually before L39e-L31e-LXa-eIF6 |
| S24e, S27ae | 2 | 18 | 76.9 | rpoE1-rpoE2-HP-S24e-S27ae-(COG5330) |
| S24e, S27ae | 3 | 1 | 15.3 | Alternative: S24e-S27ae-COG5330 |