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Alpha-solenoid of protein phosphatase 2A (PP2A) The catalytic subunit is colored salmon and the regulatory subunit is colored light yellow. The scaffold subunit, an alpha-solenoid with heat repeats, is colored light blue. The paired helices of the heat repeats (red and green) are held together by hydrophobic residues: Leucine (blue), Isoleucine (magenta), and Valine (cyan). Crystal structure of a protein phosphatase 2A heterotrimeric holoenzyme. (PubMed) 2iae (PDB)
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