has part has part has_part only in taxon only_in_taxon anatomical entity anatomical entity muscle cell Eumetazoa anatomical structure muscle structure uberon in some organisms such as drosophila, muscles can be single cells. This class groups together all discrete muscle elements, from multicellular muscle organs in vertebrates, to individual single-cell muscles in drisophila FMA:30316 Muscle structures are contractile cells, tissues or organs that are found in multicellular organisms[GO]. EMAPA:32715 FBbt:00005073 UBERON:0005090 muscle element muscle musculus