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Background: The Mg-protoporphyrin IX monomethyl ester cyclase is one of the 15 enzymes required for biosynthesis of chlorophyll in plants. The Ycf54 protein is a component associated with this enzyme and probably functions as a chaperone. Due to the lack of mutants in the Ycf54 gene, we targeted this gene in barley (Hordeum vulgare L.) by RNA-guided Cas9 genome editing to dissect its role in chlor
