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Spore germination of B. subtilis 168 and a yaaH mutant. The germination of B. subtilis spores was monitored by measuring the optical density at 660 nm at the indicated times after the addition of l-alanine (circles), AGFK (squares), or control buffer (triangles). The efficiency of germination is expressed as relative absorbance. Open symbols, 168 (yaaH+); filled symbols, mutant NIS8114 (yaaH).
