(A and C) Plate images of Mnr mutants after application
of Mnr screening techniques 1 (anaerobic) (A) and 2 (aerobic) (C) with
strains oriented as follows: S. putrefaciens wild type,
upper left; anaerobic respiratory mutant T121, upper right; Mnr mutant
48-4, bottom left; Mnr mutant 10-10, bottom right. (B and D) Plate
images of Fer mutants after application of Mnr screening techniques 1
(anaerobic) (B) and 2 (aerobic) (D) with strains oriented as follows
(from top to bottom): wild type, B29, B41, and A5 (lefthand column);
T121, B31, B43, A27, and C23 (middle column); B25, B39, B45, and B101
(righthand column). Note that black color intensity corresponds to
benzidine blue color intensity with each screening technique.