A common problem for the purple leaf plum tree is blossom blight, in which first the flowers, then young leaves, turn brown and wither, according to Grow Fruit by Alan Buckingham.
Once 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.
- 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.