Browse the hierarchy
Choose a species from the top-right selector. The tree shows that species' L1 lineages. Select any lineage to see its definition and expand children.
Levels describe evidence-backed depth: L1 contains
the retained top-level identities, while L2 through
L4 add supported refinements where the evidence permits.
Nodes marked terminal carry an explanatory note.
The URL follows your selection, so any lineage can be shared as a
link such as #homo_sapiens/…/CD8+ T cell.