Further define MARCO and SR-AI/II function, and may also be useful to identify other novel scavenger-type macrophage receptors and for additional studies of particle toxicology.BackgroundThe pulmonary alveolar macrophage (AM) plays an important role in defense of the lung [1-5]. Class A scavenger receptors (SRA) primarily expressed on the macro-phage (M? surface are critical for binding, uptake, a