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Cysteine levels in transformed strains of UCD522 and UCD713 under high-nitrogen (open symbols) or low-nitrogen (solid symbols) conditions. Testing was performed on vector-transformed UCD522 (○, ●) and pMET17-transformed UCD522 (◊, ⧫) and on vector-transformed UCD713 (□, ■) and pMET17-transformed UCD713 (▵, ▴).
