Cell Ontology (CL)
Structured vocabulary for cell types in animals. Covers 30+ organ systems with lineage relationships.
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Where this one tends to earn its keep.
Single-cell RNA-seq cell type annotation
Stem cell differentiation pathway modeling
Immunology cell classification
Histology and pathology cell typing
I haven't checked this label against the actual licence text — it's the catalogue's original guess. Check the ontology's own site before you rely on it.
Others worth a look in Life Sciences.