- Avidin related protein 2 shows unique structural and functional features among the avidin protein family. Hytönen, V.P., Määttä, J.A., Kidron, H., Halling, K.K., Hörhä, J., Kulomaa, T., Nyholm, T.K., Johnson, M.S., Salminen, T.A., Kulomaa, M.S., Airenne, T.T. BMC Biotechnol. (2005)