has part has part characteristic of part of has modifier Phenotypic abnormality Abnormality of the immune system The immune system is composed of organs and interdependent cell types that collectively protect the body from infections and from the growth of tumor cells. The organs of the immune system comprise the bone marrow, the spleen, the thymus,the lymph nodes, and the cell types comprise B cells, T cells, natural killer cells, granulocytes,dendritic cells, and macrophages. quality abnormal immune system