(Structure 16 , 1086–1094; July 9, 2008) In this paper, a cocrystal structure was described of the G-protein heterodimer Gβ1γ2 bound to a C-terminal peptide from the parathyroid hormone receptor-1 (PTH1R) at 3.0 A resolution (PDB id 2QNS). A subsequent refinement was later deposited in the Protein Data Bank (PDB id 3KJ5). While this structure represents a new crystal form of the Gβ1γ2 heterodimer, because of the lack of clear and continuous electron density for the receptor peptide in the complex structure, the paper is being retracted. We apologize for any confusion this may have caused.