composed primarily of material entity material entity cellular_component anatomical cluster multi cell part structure UBERON:0005162 cell part cluster FBbt:00007060 FMA:83115 we go with the FMA classification rather than the CARO one. FMA def: 'Anatomical cluster which has as direct parts cell parts from two or more cells.' CARO:0001000 multi-cell-part structure A structure consisting of multiple cell components but which is not itself a cell and does not have (complete) cells as a part. uberon AAO:0011000 multi-cell-component structure