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Euglena gracilis biosynthesis pathways of β-carotene (A), ascorbate (B), α-tocopherol (C), and polyunsaturated fatty acids (D) (Shigeoka et al., 1992; Kim et al., 2004; Ishikawa et al., 2006; Ishikawa and Shigeoka, 2008; Lohr et al., 2012; Pollak et al., 2012; O'Neill et al., 2015b; Kato et al., 2016; Hasan et al., 2017). Only central enzymes/substrates/intermediates/products are shown.
