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In the phylogeny of plant polyamine oxidases (PAOs), clade III members from angiosperms, such asArabidopsis thaliana PAO5 andOryza sativa PAO1, prefer spermine and thermospermine as substrates and back‐convert both of these substrates to spermidine in vitro. A clade III representative of lycophytes, SelPAO5 fromSelaginella lepidophylla, also prefers spermine and thermospermine but instead back‐converts...
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