ultraweak luminescence in the spectral region 300-660 nm is generated in the enzymatic ( tyrosinase ec.1.14.18.1 ) and autooxidative polymerization of l-dopa , 5-s-cysteinyl-dopa , and l-dopa + cysteine to eumelanins and pheomelanins , respectively .
C0013023
dopa
C0023570
l-dopa