0 2 0 http://purl.obolibrary.org/obo/NCRO_0004001 circular non-coding RNA 'circular non-coding RNA' SubClassOf 'non-coding RNA' http://purl.obolibrary.org/obo/NCRO_0004000 non-coding RNA 'non-coding RNA' SubClassOf http://purl.obolibrary.org/obo/BFO_0000040