<unk> s belong to a group of white blood<unk> s known as lymphocytes, and play a central role in<unk> -mediated immunity. They can be distinguished from other lymphocyte types, such as<unk> s and NK<unk> s by the presence of a special receptor on their<unk>  surface called the<unk>  receptor (TCR). The abbreviation T, in<unk> , stands for thymus, since it is the principal organ in the<unk> 's development.
T cell
Dendritic cell
B cell
Reactive lymphocyte
Monocyte
Lymphocyte
Neutrophil
Platelet