“The notable decrease in free energy from trimer to tetramer suggested that the aggregation process was cooperative.”

“Then we examined whether or not the quaternary structure of arrestin tetramer in solution is identical to that in crystal.”

“Numerous studies suggest that the smallest multimer with full catalytic activity is a tetramer or an octamer.”

“This analysis also explains why most repressers and activators bind as dimers and tetramers, not trimers or pentamers.”

“Proanthocyanidin mixtures from grapes are a combination of dimers, trimers, tetramers, oligomers, and polymers.”

“Electron microscopy observations of disintegrating IF revealed the existence of two oligomeric levels consisting of tetramers assembled into octamers.”