21. Proteins of the IgSF possess a structural domain known as an sheets of antiparallel beta strands. 22. Native SAA1 is a hexamer with each subunit assuming an antiparallel 4-helix bundle structure. 23. It forms a three-stranded antiparallel beta-sheet supported by the conserved disulfide bridge. 24. There is a central ? sheet that is composed of one parallel strand and three antiparallel strands. 25. These daughter copies each contain one strand from the parental duplex DNA and one nascent antiparallel strand. 26. This domain consists of a five-stranded antiparallel beta-sheet twisted around an alpha helix. 27. Three-dimensional structural data have shown that a TPR region forms two antiparallel alpha-helices. 28. Due to dipole coupling of the ferromagnetic layers results in antiparallel alignment of the magnetization of the ferromagnets. 29. Early thought experiments for unbound singlets usually assumed the use of two antiparallel spin 1 / 2 electrons. 30. In all cases, including factor D, there are two antiparallel loops connecting the secondary structural elements.
