Texas Protein quaternary structureGeneral Globular protein Fibrous protein Membrane protein Coiled coil Dimers Leucine zipper Tryptophan repressor Glutathione S-transferase Trimers Collagen Hemagglutinin Ornithine transcarbamylase Tetramers Hemoglobin IgG Avidin Spectrin Hexamers DnaB helicase Hemocyanin Glutamate Dehydrogenase 1 Octamers Nucleosome Hemerythrin Fibrils Actin Tubulin Flagellum Pilus Complexes Eukaryotic translation Transcription preinitiation complex Immunoglobulin M Machines Proteasome Ribosome ATP synthase RNA polymerase Spliceosome Virus Capsid Precipitates Salting out Hofmeister series Methods Ultracentrifugation Size exclusion chromatography