| This analysis also explains why most repressers and activators bind as dimers and tetramers, not trimers or pentamers. |
| First, the tetrameric structure of the protein and the propensity of tetramers to oligomerize further into aggregates impeded its utility as a fusion partner. |
| Electron microscopy observations of disintegrating IF revealed the existence of two oligomeric levels consisting of tetramers assembled into octamers. |
| Proanthocyanidin mixtures from grapes are a combination of dimers, trimers, tetramers, oligomers, and polymers. |
| In contrast to the dimers which prevail in the dephosphorylated state, the tetramers or higher oligomers of the NtrC-like proteins represent the active regulator species. |
| These ions correspond in molecular weight to both trimers and tetramers. |
