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An Amino Acid Residue (other Than Glycine) Has No Symmetry Elements. The General Operation Of Conversion Of One Residue Of A Single Chain Into A Second Residue Equivalent To The First Is Accordingly A Rotation About An Axis Accompanied By Translation Along The Axis. Hence The Only Configurations For A Chain Compatible With Our Postulate Of Equivalence Of The Residues Are Helical Configurations.

-Linus Pauling

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An Amino Acid Residue

Linus Pauling

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An Amino Acid Residue (other Than Glycine) Has No Symmetry Elements. The General Operation Of Conversion Of One Residue Of A Single Chain Into A Second Residue Equivalent To The First Is Accordingly A Rotation About An Axis Accompanied By Translation Along The Axis. Hence The Only Configurations For A Chain Compatible With Our Postulate Of Equivalence Of The Residues Are Helical Configurations.

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