Ontology for Biomedical Investigations
Ontology for life-science investigations — study designs, protocols, instruments, data, analyses.
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Where this one tends to earn its keep.
Annotate experimental study designs
Describe scientific protocols formally
Instrument and assay classification
Investigation metadata standardization
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.