FIG. 3.

HAP sensitivities of various mol mutants defective in molybdenum cofactor synthesis. The central filter disc contained HAP (100 μg) (left plate) or no HAP (right plate). Suspensions of eight different strains were applied in a series of spots radiating out from the central disc. The strains, arranged in isogenic pairs, are NR13044 (moe⁺) (1), NR13043 (moeA5) (2), NR13036 (moa⁺) (3), NR13035 (moaA1) (4), NR13040 (moa⁺) (5), NR13039 (moaA18) (6), NR13032 (mod⁺) (7), and NR13031 (modC4) (8). See Table 1 and Materials and Methods for strain details.