<http://presszoom.com/story_130850.html>:

"An advanced imaging technique known as electron tomography has
allowed researchers at the National Cancer Institute ( NCI ), part of
the National Institutes of Health ( NIH ), to visualize an 'entry
claw,' a unique structure formed between the human immunodeficiency
virus ( HIV ) that causes AIDS and the cell it infects.

[...]

'The discovery of the entry claw raises many fundamental questions
about viral entry into host cells,' said Subramaniam. 'What are its
precise molecular components? How does the viral genetic core actually
transfer to the host cell? What are the other intermediate steps of
the entry claw formation and can they be visualized? As we continue to
improve the technology, we believe we will answer these and other
related questions.'"

A link in the article goes here:
<http://hrem.nci.nih.gov/html/research2.html>.

Nice pictures, but the caption reads: "Image of isolated SIV particles
(kindly provided by Dr. Jeff Lifson, NCI) and a cultured macrophage.
Both images were recorded on frozen hydrated samples at liquid
nitrogen temperatures."

So, they're pictures of very cold samples of 'SIV particles.'  The
actual  pictures referred to in the article don't appear to have been
published.

Oh, and why are cancer researchers involved in HIV research?  I
suppose old habits die hard. :)