title: Ordering an engagement ring.
abstract: In this issue of Molecular Cell, Tomko et al. (2010) establish that the six distinct ATPase subunits of the eukaryotic proteasome form a heterohexameric ring and resolve how the subunits are arranged within the ring.
authors.affiliation: Department of Microbiology and Immunology, University of California, San Francisco, San Francisco, CA 94143-0414, USA.
authors.forename: Martin A
authors.initials: MA
authors.lastname: Hoyt
authors.forename: Philip
authors.initials: P
authors.lastname: Coffino