{"@context":{"obo_purl":"http://purl.obolibrary.org/obo/","rdf":"http://www.w3.org/1999/02/22-rdf-syntax-ns#","owl":"http://www.w3.org/2002/07/owl#","rdfs":"http://www.w3.org/2000/01/rdf-schema#","skos":"http://www.w3.org/2004/02/skos/core#","oboinowl_gen":"http://www.geneontology.org/formats/oboInOwl#","ns0":"http://purl.obolibrary.org/obo/uberon/core#","metadata_def":"http://data.bioontology.org/metadata/def/","metadata":"http://data.bioontology.org/metadata/","ns1":"http://data.bioontology.org/metadata/obo/"},"@graph":[{"@id":"obo_purl:UBERON_0000948","@type":"owl:Class","rdfs:subClassOf":[{"@id":"obo_purl:UBERON_0007100"},{"@id":"obo_purl:UBERON_0004120"},{"@id":"obo_purl:UBERON_0005181"},{"@id":"obo_purl:UBERON_0010314"}],"rdfs:label":"heart","rdfs:comment":"Taxon notes:\" the ascidian tube-like heart lacks chambers....The ascidian heart is formed after metamorphosis as a simple tube-like structure with a single-layered myoepithelium that is continuous with a single-layered pericar- dial wall. It lacks chambers and endocardium.... The innovation of the chambered heart was a key event in vertebrate evolution, because the chambered heart generates one-way blood flow with high pressure, a critical requirement for the efficient blood supply of large-body vertebrates... all extant vertebrates have hearts with two or more chambers (Moorman and Christoffels 2003)\" DOI:10.1101/gad.1485706","skos:notation":"UBERON:0000948","obo_purl:IAO_0000115":"A myogenic muscular circulatory organ found in the vertebrate cardiovascular system composed of chambers of cardiac muscle. 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