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Aminopeptidase, Yeast, Electron Microscopy, Quaternary Structure Electron micrographs of native aminopeptidase I and of isolated subfragments were taken after negative staining with uranyl formate. From these studies and from the chemical evidence sum­ marized in the preceding paper it is concluded that the active enzyme is a dodecamer possessing pseudo-D 3  symmetry with the dimer as the smallest symmetric unit.

The Quaternary Structure of Yeast Aminopeptidase I: 2. Geometric Arrangement of Subunits