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This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution license (http://creativecommons.org/licenses/by/3.0/).
ML phylogenetic tree of β-ketosynthase (KS) domains from PKSs and hybrid PKS-NRPS based on RAxML algorithm. Numbers at nodes indicate bootstrap support, reported when ≥50% for each clade performed with 1,000 replications. NR: non-reducing; HR: highly reducing; PR: partially reducing.