object 客体 material entity 物质实体 cellular_component cellular_component 细胞组分 A location, relative to cellular compartments and structures, occupied by a macromolecular machine when it carries out a molecular function. There are two ways in which the gene ontology describes locations of gene products: (1) relative to cellular structures (e.g., cytoplasmic side of plasma membrane) or compartments (e.g., mitochondrion), and (2) the stable macromolecular complexes of which they are parts (e.g., the ribosome). GO:0005575 GO:0008372 NIF_Subcellular:sao-1337158144 NIF_Subcellular:sao1337158144 Note that, in addition to forming the root of the cellular component ontology, this term is recommended for use for the annotation of gene products whose cellular component is unknown. When this term is used for annotation, it indicates that no information was available about the cellular component of the gene product annotated as of the date the annotation was made; the evidence code "no data" (ND), is used to indicate this. cell or subcellular entity cellular component cellular_component subcellular entity