Table 2.
Vertebrate microRNA clusters. The table lists the maximal number of microRNAs in a single copy of the cluster ("Members"), the maximal number of non-homologous microRNAs in a single copy ("Families"), and the maximal number of paralogous cluster copies in any of the investigated genomes.
| Cluster | Members | Families | Paralogs |
| let-7 | 3 | 3 | 18 |
| mir-1 | 2 | 2 | 4 |
| mir-2 | 4 | 2 | 5 |
| mir-3 | 9 | 6 | 3 |
| mir-9 | 4 | 3 | 7 |
| mir-12 | 2 | 2 | 1 |
| mir-15 | 2 | 1 | 5 |
| mir-17 | 6 | 3 | 9 |
| mir-23 | 3 | 3 | 6 |
| mir-29 | 3 | 2 | 8 |
| mir-30 | 2 | 1 | 3 |
| mir-34 | 2 | 2 | 3 |
| mir-35 | 7 | 7 | 1 |
| mir-42 | 3 | 3 | 2 |
| mir-46 | 2 | 2 | 5 |
| mir-51 | 4 | 4 | 1 |
| mir-54 | 3 | 3 | 1 |
| mir-61 | 2 | 2 | 1 |
| mir-64 | 4 | 4 | 1 |
| mir-73 | 2 | 2 | 1 |
| mir-77 | 2 | 1 | 1 |
| mir-96 | 3 | 3 | 2 |
| mir-105 | 3 | 1 | 1 |
| mir-127 | 2 | 1 | * 2 |
| mir-130 | 2 | 2 | 5 |
| mir-132 | 2 | 1 | 2 |
| mir-134 | >50 | 6 | * 1 |
| mir-141 | 2 | 1 | * 2 |
| mir-143 | 2 | 2 | 1 |
| mir-181 | 2 | 1 | 8 |
| mir-191 | 2 | 2 | * 1 |
| mir-192 | 2 | 2 | 2 |
| mir-202 | 2 | 1 | 1 |
| mir-204 | 2 | 1 | 3 |
| mir-216 | 2 | 1 | 2 |
| mir-221 | 2 | 1 | 4 |
| mir-232 | 2 | 1 | 1 |
| mir-249 | 2 | 1 | 1 |
| mir-275 | 2 | 2 | 1 |
| mir-276 | 2 | 1 | 1 |
| mir-290 | 6 | 1 | 6 |
| mir-296 | 2 | 1 | 2 |
| mir-302 | 5 | 2 | 5 |
| mir-310 | 4 | 4 | 1 |
| mir-344 | 3 | 1 | 1 |
| mir-357 | 2 | 2 | 2 |
| mir-374 | 3 | 2 | 1 |
| mir-450 | 3 | 1 | 1 |
* part of the human mir-134 cluster experimentally investigated in [33]. In the same study it is reported that mir-144 and mir-224 are also parts of clusters with additional microRNAs that do not have orthologs in the MR 6.0.