41. Unlike either glgX or AGL, however, treX exists as a dimer and tetramer in solution. 42. Stick model of the crystal structure of the phenyllithium etherate tetramer -ether ethyl groups omitted for clarity 43. It is commonly used in immunoassays such as FACS, flow cytometry, multimer / tetramer applications. 44. Hydrocarbon solvents such as benzene favour formation of the hexamer, whereas ethereal solvents favour the tetramer . 45. The eukaryotic enzyme is a circular tetramer of homodimers, while the prokaryotic enzyme is a dimer. 46. The amidotransferase domains are located away from the tetramer interfaces and are not affected by the oligomeric state. 47. All orthologs of the enzyme maintain an asymmetric tetramer quaternary structure with a cleft containing the active site. 48. The tetraborate anion ( tetramer ) includes two tetrahedral and two trigonal boron atoms symmetrically assembled in cyclic structure. 49. Secondly, two dimers combine to form the four-chain tetramer , and this becomes the functional haemolglobin. 50. In mammals, the enzyme is a tetramer of four identical subunits of approximately 50, 000 Daltons each.
