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From 2012.igem.org

PnAS

A big challenge of our project is the attachment of ligands and functional proteins on either the outside or inside of a virus-like particle (VLP). We decided to use a noncovalent anchor-like system, which consists of two different coiled-coil proteins. For various experiments the E-/K-coil combination IAAL E3 and IAAL K3 reported by Litowksi et al. in 2002 was used. File:Https://static.igem.org/mediawiki/2012/7/7b/GNC4 homodimer.jpg