a cell nucleus is a part of a cell
somatic_cell_nucleus is not cell_nucleus. cell_nucleus is not group_of_cell_parts. cell_nucleus is nuclear_body. cell_nucleus is organelle. structural_cell_part is cell_part. human_somatic_cell_nucleus is cell_nucleus. somatic_cell_nucleus is cell_nucleus. cell_nucleus is group_of_cell_parts. nucleus is center.