Introduction to the Nuclear Receptor Review Series.

The article discusses various reports on nuclear receptors (NRs) published within the issue including one by Ajay Chawla on how the peroxisome proliferator-activated receptor (PPAR) family of NRs function in the macrophage, another by Jorge Plutzky on the roles of NRs in vascular bology and disease and another one by Richard Karas on the biological actions of estrogen receptors (ERs).