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(a) Structures of six prochlorosins (Pcns).7,44 Cys residues are highlighted in orange and other residues involved in thioether macrocycles in green. Residues that are posttranslationally modified during maturation, but not involved in cyclization are shown in blue. (b) Schematic depiction of Pcn2.8. Abu = aminobutyric acid. Obu = 2-oxobutyryl.
