File talk:Amino Acids.svg

Opacity issues
Is there a reason for the opacity to be 0.75 in the "Hydrophobic Side Chains" section? If not, I may just upload one that has the opacity to be 1.0 which would make it consistent with the other sections.

stereochemistry issue
Some of the amino acids, e.g., lysine have also wedged bonds for non-chiral atoms. These bonds should be changed to normal bonds. — Preceding unsigned comment added by 134.2.69.163 (talk) 10:07, 8 December 2011 (UTC)

pka values
I am not 100% sure the pka for selenocysteine is accurate. — Preceding unsigned comment added by Vokesk (talk • contribs) 01:05, 5 January 2012 (UTC) Glutamine should have a double bondEd oxygen in the picture — Preceding unsigned comment added by 174.255.17.232 (talk) 15:50, 28 February 2012 (UTC)

Cyclic groups shaded white implies a solid surface
Is there any reason why the cyclic groups are 'shaded' white (e.g. H; P; F; Y and W)? This implies that these groups have some sort of solid surface rather than being (for want of a better word) 'hollow'. — Preceding unsigned comment added by 203.94.168.254 (talk) 07:02, 6 June 2012 (UTC)

Top most 'OH's
As a minor point the top most 'OH's are drawn a little unconventionally. It would be more normal to draw these 'OH's with the 'H' in the same horizontal plane (i.e. level) with the 'O', and to the right of the 'O' so as the look more like this: OH - rather than the 'H's being at a (jaunty) 45 degree angle. For example see the 'H's on the 'N' atoms, these 'H's are level with the 'N's. — Preceding unsigned comment added by 203.94.168.254 (talk) 07:12, 6 June 2012 (UTC)

Duplicate Image
Both this image and File:Molecular structures of the 21 proteinogenic amino acids.svg appear to be practically the same other than a few corrections in this one. Migrate to one and remove other as duplicate? - Devon (talk) 04:19, 17 October 2012 (UTC)

Are Proline and Tyrosine correct? Or are they polar and non-polar? — Preceding unsigned comment added by SimianRosso (talk • contribs) 18:50, 31 October 2012 (UTC)

Histidine pKa/charge
The Histidine pKa refers to a proton bound to the nitrogen on the other side of the ring. 131.111.184.83 (talk) 11:06, 18 May 2013 (UTC)

Zwiterionic forms
In this figure, amino-acid sidechains are charged. This refers to a given range of pH values (the physiological one). In this range, the amino-acids are in the zwiterionic form and they have to be shown in that state. Yves-henri (talk) 07:26, 15 January 2014 (UTC)