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NTR: fibroblast specimen
subClassOf http://purl.obolibrary.org/obo/OBI_0001468, 'cell specimen'
derives from some fibroblast, http://purl.obolibrary.org/obo/CL_0000057, which is already in OBI
Proposed Definition: A cell specimen comprised of a population of fibroblast cells. Superclass: Cell specimen
Perhaps subclasses would/could indicate anatomical source.