T-Cells & B-Cells
A T cell is a type of lymphocyte which develops in the thymus that plays a central role in the immune response. T cells can be distinguished from other lymphocytes by the presence of a T-cell receptor on the cell surface. The name T cell originates from the thymus where they develop from precursor cells derived from the bone marrow.
B cells are also known as B lymphocytes, are a type of white blood cell of the lymphocyte subtype. They function in the humoral immunity component of the adaptive immune system by secreting antibodies. Additionally, B cells present antigen and secrete cytokines.