Amino Acid Cystine Flag: Cys or C

The flag for Cystine uses the colours white, yellow, mustard-yellow, and black.  The field of mustard yellow indicates that this amino acid contains sulfur.  The single black dot indicates there is only one carbon in its functional group.  Along the hoist is a white and yellow vertical stripe.

This stripes are coded to the letter C according to colour metrics.  Reason being, yellow is the third colour of the rainbow and C is the third letter of the alphabet.  Also C is the short, short hand notation for Cystine.  The three letter abbreviation is Cys. 

You can blame this amino acid for the rotten egg smell and the stinky smell at perms.  When hair is being permed, the process breaks down the sulfur in ones hair.  The result is that poopey smell that you may have noticed at the hair dresser.  Sure, they try to mask it with sweet perfumes, but you can't hide that eggy smell when these amino acids are broken down.

This amino acid was discovered in 1810 by William Hyde Wollaston.  Wollaston also discovered Palladium and Rhodium.