Keywords: Cystine zwitterion 3D ball.png Ball-and-stick model of the cystine molecule an amino acid formed from two cysteine molecules This image shows it as a zwitterion Colour code 505050 Carbon C black<br> F0F0F0 Hydrogen H white<br> F51E1E Oxygen O red<br> 3C50FA Nitrogen N blue<br> FAEB00 Sulfur S yellow<br> 2011-06-27 own DS Visualizer Jynto talk Neutral form ball-and-stick version Neutral form space-filling version Zwitterion space-filling version cc-zero Images by Jynto Cystine Zwitterions |