Re--6 Powerful virus-destroying machines (cylinders) attracted to virus by TRIM21--
Those cylinders are proteasomes:
http://en.wikipedia.org/wiki/Proteasome
They eat viruses (enveloped or not) up when they are attracted to them by TRIM21.
The chain is as follows:
Virus attracts antibodies.
Antibodies attract TRIM21.
TRIM21 attracts the proteasome cylinders.