Figure 1

![Figure 1: Biosynthetic pathways for 5-hydroxytryptophan production in microbial systems, showing the tryptophan hydroxylation route and alternative enzymatic strategies. Key enzymes including tryptophan hydroxylase and pterin-dependent monooxygenases are mapped with their cofactor requirements.](https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7901931/bin/fbioe-09-624503-g0001.jpg)

> Source: Xin-Xin Liu et al. "Advances in the Microbial Synthesis of 5-Hydroxytryptophan.." *Frontiers in bioengineering and biotechnology*, 2021. PMID: [33634088](https://pubmed.ncbi.nlm.nih.gov/33634088/)

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  <img src="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7901931/bin/fbioe-09-624503-g0001.jpg" alt="Biosynthetic pathways for 5-hydroxytryptophan production in microbial systems, showing the tryptophan hydroxylation route and alternative enzymatic strategies. Key enzymes including tryptophan hydroxylase and pterin-dependent monooxygenases are mapped with their cofactor requirements." />
  <figcaption>Figure 1. Biosynthetic pathways for 5-hydroxytryptophan production in microbial systems, showing the tryptophan hydroxylation route and alternative enzymatic strategies. Key enzymes including tryptophan hydroxylase and pterin-dependent monooxygenases are mapped with their cofactor requirements.<br>  Source: Xin-Xin Liu et al. "Advances in the Microbial Synthesis of 5-Hydroxytryptophan.." <em>Frontiers in bioengineering and biotechnology</em>, 2021. PMID: <a href="https://pubmed.ncbi.nlm.nih.gov/33634088/">33634088</a></figcaption>
</figure>