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Genome-wide screen for E. coli export signals yields YmgD and NarG. a, growth of DR473 and DR473 secB- cells expressing YmgD-PhoA after 48 h at 30 °C on agar plates supplemented with BCIP and arabinose (Ara+) to render the cytoplasm C:red. b, growth of DR473 and DR473 tatC- cells expressing NarG-PhoA after 48 h at 30 °C on agar plates supplemented with BCIP and either glucose (Glu+) or arabinose, as indicated.
