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* <scene name='Asymmetric_Unit/Unit_cell/5'>Unit Cell</scene>. In the case of [[2qcb]], the unit cell contains portions of 16 copies of the asymmetric unit. <!--<font color="red">Sorry, still not working. See instructions below.</font>-->
* <scene name='Asymmetric_Unit/Unit_cell/5'>Unit Cell</scene>. In the case of [[2qcb]], the unit cell contains portions of 16 copies of the asymmetric unit. <!--<font color="red">Sorry, still not working. See instructions below.</font>-->


The '''asymmetric unit''' is the smallest portion of a crystal that, when duplicated and moved by crystal symmetry operations, can produce the unit cell of the crystal. The symmetry operations that are common for biological molecules are rotation, translation, and screw operations (which combine rotation and translation). Mirror symmetry planes occur rarely in crystals of biological molecules due to the presence of chiral centers, e.g. L or D amino acids.
The '''asymmetric unit''' is the smallest portion of a crystal that provides a complete solution. When duplicated and moved by crystal symmetry operations, the unit cell of the crystal can be generated, and from the unit cell, large portions of the crystal. The symmetry operations that are common for biological molecules are rotation, translation, and screw operations (which combine rotation and translation). Mirror symmetry planes occur rarely in crystals of biological molecules due to the presence of chiral centers, e.g. L or D amino acids.


The '''[[Biological Unit|biological unit]]''' is defined elsewhere.
The '''[[Biological Unit|biological unit]]''' is defined elsewhere.
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The '''unit cell''' is the smallest portion of a crystal that, when duplicated and translated, can generate the entire crystal.
The '''unit cell''' is the smallest portion of a crystal that, when duplicated and translated, can generate the entire crystal.
<blockquote>
<blockquote>
<font color="gray">If the green link "Unit Cell" above is not working, you can '''see the unit cell''' by clicking on the word ''Jmol'' to the lower right of any molecular display in Jmol (which includes most interactive molecular displays in Proteopedia), and then on the menu that appears, Style, then check the Unit Cell checkbox. You can populate the unit cell from Jmol's menu with Symmetry, Reload {1 1 1}.</font>
<font color="gray">If the green link "Unit Cell" above is not working, you can '''see the unit cell''' by right-clicking on the molecule in JSmol, and then on the menu that appears,
<!--Style, Unit Cell, On. You can populate the unit cell from Jmol's menu with -->
Symmetry, Reload {1 1 1}.</font>
</blockquote>
</blockquote>


Proteopedia Page Contributors and Editors (what is this?)Proteopedia Page Contributors and Editors (what is this?)

Eric Martz, Eran Hodis, Wayne Decatur
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