The receptors match only one specific antigen. White blood cells called lymphocytes originate in the bone marrow but migrate to parts of the lymphatic system such as the lymph nodes, spleen, and thymus. There are two main types of lymphatic cells, T cells and B cells.nce activated, helper T cells start to divide and to produce proteins that activate B and T cells as well as other immune cells. The killer T cell is specialized in attacking cells of the body infected by viruses and sometimes also by bacteria. It can also attack cancer cells.
Use tubercular in a sentence. 1  of, like, or having a tubercle or tubercles. 2  of, relating to, or having tuberculosis. 3  caused by the tubercle bacillus.
Unicellular. Definition. adjective. (1) Having or consisting of only one cell. (2) Pertaining to an organism whose functions are all carried out within one cell.Supplement. Examples of organisms that are unicellular are microorganisms such as bacteria and some algae such as diatoms.Word origin: L Å«ni-comb. form of Å«nus one + NL cellulÄris, equiv. to cellul(a) live cell. Related forms: unicellularity (noun). Compare: multicellular.upplement. Examples of organisms that are unicellular are microorganisms such as bacteria and some algae such as diatoms. Word origin: L Å«ni-comb. form of Å«nus one + NL cellulÄris, equiv. to cellul(a) live cell.