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Copyright 2005 by Eric Martz,
University of Massachusetts, Amherst MA USA.

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Phytochrome Knot
shown as thicker backbone.

The backbone is colored with a rainbow sequence from the Amino to Carboxy ends. The ends are marked with balls. Conceptually, pulling on the ends would straighten the backbone, revealing the knot. The biliverdin chromophore is shown in ball-and-stick with a dot surface. The dotted line represents a portion of the backbone that could not be resolved due to crystallographic disorder.
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More information is available about knots in proteins, including movies of "pulling the string" to reveal the knot.


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