A. Rose, S. J. Schraegle, E. A. Stahlberg and I. Meier. (2005). Coiled-coil protein composition of 22 proteomes--differences and common themes in subcellular infrastructure and traffic control. In: BMC evolutionary biology, Volume 5, article 66. Entrez PubMed16288662 Rose et al. suggest that coiled-coil alpha helical vesicle transport proteins are only found in eukaryotic organisms.