anchor.diff:  			and then move the mouse in the desired direction.<br>
   			<b>Rotate:</b> Press and hold the left mouse button, and then move the mouse in the desired
   			direction to rotate along the x and y axes. To be able to rotate along the z-axis, you need to
  -			press and hold the SHIFT key and the left mouse button, and then move the mouse left or right.
  +			press and hold the SHIFT key and the left mouse button, and then move the mouse left or right.<br>
  +			<b>Reset:</b> Press and hold the SHIFT key, and then double click on the background
  +			to reset the orientation and the zoom level to the initial state.
   		</div>
   		<table>
   			<tr>
  
positive.code: 									<option value='bySecondaryStructure'
  									        title='Color by Secondary Structure'>secondary structure</option>
  									<option value='byChain'
  									        title='Color by Chain'>chain</option>
  									<option value='byAtomType'
  									        title='Color by Atom Type'
  									        disabled='disabled'>atom type</option>
  
negative.code: 	<span class='mutation-3d-beta-sheet'>beta sheets</span>, and
  	<span class='mutation-3d-loop'>loops</span>.
  	This color option is not available for the space-filling protein scheme.<br>
  	<b>N-C rainbow:</b> Colors the protein with a rainbow gradient
  	from red (N-terminus) to blue (C-terminus).<br>
  	<b>Atom Type:</b> Colors the structure with respect to the atom type (CPK color scheme).
  	This color option is only available for the space-filling protein scheme.<br>
  