The term ZBA (Zero Balance Account) is sometimes used to describe a transit account. In reality, ZBAs are a completely different story and are usually used in an acquiring and merchant account context, where one party opens the account and another sweeps (clears) it daily.
Helper T cells are the major driving force and the main regulators of the immune defense. Their primary task is to activate B cells and killer T cells. However, the helper T cells themselves must be activated.
- B cells: can be activated to produce antibodies-Helper T cells: directly target and kill cancer cells-Cytotoxic T cells: carry out cellular immune responses-Regulatory T cells: release inhibitory cytokines to dampen the immune response. - Helper T cells: directly target and kill cancer cells.