Sedimentation equilibrium analysis of a Hendra F TM domain peptide indicates a best fit monomer-trimer-hexamer equilibrium. The Hendra TM peptide was prepared in C14SB detergent (protein:lipid molar ratio 1:50), and A280 data were collected at 40,000 rpm on a Beckman XL-1 analytical ultracentrifuge using a two-channel centerpiece. A–C, the predicted curves (dark lines) for monomer (A), monomer-trimer (B), and monomer-trimer-hexamer (C) fits are shown and superimposed with actual data points.