Skip to main content
. Author manuscript; available in PMC: 2014 May 26.
Published in final edited form as: Bioessays. 2013 May 7;35(8):672–676. doi: 10.1002/bies.201300020

Figure 2. Eumelanin polymers are composed of DHI and DHICA units, while pheomelanin polymers are composed of benzothiazole and benzothiazine units.

Figure 2

Chemical structures of (a) eumelanin monomer units and (b) pheomelanin monomer units are shown above. DHI is 5,6-dihydroxyindole. DHICA is 5,6-dihydroxyindole-2-carboxylic acid. Oligomers of these units constitute the biological pigments [25].