Human dendritic cell derived from peripheral blood progenitors with recombinant interleukin-4 and granulocyte-macrophage colony-stimulating factor (GM-CSF). The cells have long microvillous surface processes and numerous cytoplasmic lysosomes in addition to a well-formed golgi apparatus (uranyl acetate, lead citrate, original magnification ×2,500). (Courtesy of Jonathan W. Said, Kai Chien, Walter Verbeek, Jeffrey Weber, H. Phillip Koeffler, UCLA Center for the Health Sciences, University of Southern California, and Cedars Sinai Medical Center, Los Angeles, CA.) {/ANNT;80256n;;center;0n}