An eye's view of T regulatory cells.

T regulatory (Treg) cells have been studied for more than 30 years. Recently, changing technology and attitudes have led to new interest in T cell regulation of the immune responses. The eye is an immune-privileged site with unique mechanisms for the prevention of damaging immune inflammation. The eye fashions its Treg cells in novel ways to prevent immune inflammation locally and systemically. The purpose of this mini-review is to condense and summarize reports of Treg cells dependent on the eye in the context of the Treg literature in general.