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. 2014 Jul 2;4:5526. doi: 10.1038/srep05526

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DBH- dopamine β- hydroxylase, DDC- Dopa decarboxylase, PNMT- phenyl ethanolamine-N-methyltransferase, PO- phenoloxidase, TDC- tyrosine decarboxylase, TBH- tyramine beta hydroxylase, TPH- tryptophan hydroxylase. The green and blue squares mark the metabolic reactions specific for either invertebrates or vertebrates respectively. The dotted arrow represents a salvage pathway which might exist¹². Its physiological relevance is unknown.