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| PubMed | Entrez | BLAST | Genome | Taxonomy | Structure |
| or |
| root (99 nodes) |
 eukaryotes (97 nodes) |
 animals (54 nodes) |
| chordates (26 nodes) |
| birds (7 nodes) |
| lizards & snakes (6 nodes) |
| mammals (5 nodes) |
| rodents (3 nodes) |
 even-toed ungulates (2 nodes) |
| frogs & toads (2 nodes) |
| other chordates (6 nodes) |
| arthropods (14 nodes) |
| insects (12 nodes) |
| hymenopterans (8 nodes) |
| ants (4 nodes) |
| bees (4 nodes) |
| moths (2 nodes) |
| bugs (1 node) |
| beetles (1 node) |
| arachnids (2 nodes) |
| molluscs (12 nodes) |
| gastropods (8 nodes) |
| bivalves (4 nodes) |
| jellyfishes (2 nodes) |
| green plants (43 nodes) |
 flowering plants (41 nodes) |
| other green plants (2 nodes) |
| cyanobacteria (1 node) |
| other (1 node) |
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