Researchers have used nanotubes made from human blood proteins to trap hepatitis B virus. They say their work lays the foundations for a new chemistry of protein-based nanotubes with biomedical applications.
The protein tubes are lined with antibodies that bind to hepatitis B virus proteins
More info: http://pubs.acs.org/doi/abs/10.1021/ja1096122
http://www.rsc.org/chemistryworld/News/2011/February/28021102.asp