UNIVERSITY OF MEDICINE & DENTISTRY OF NEW JERSEY / SCIENCE PHOTO LIBRARY UNIVERSITY OF MEDICINE & DENTISTRY OF NEW JERSEY / SCIENCE PHOTO LIBRARY
Transmission electron micrograph (TEM) of particles (virions) of the simian immunodeficiency virus (SIV) surrounding an infected blood cell. The viruses appear as small, roughly spherical particles with darkly-stained cores. SIV is responsible for an AIDS-like syndrome in monkeys, and is related to a second, more recently identified type of human AIDS virus, called human immunodeficiency virus type 2 (HIV-2). Magnification: x60,000 at 10x8 inch size.
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