Activity gel analysis of S. aureus SOD. Lane 1, RN6390; lane 2, HAC1; lane 3, HAC2; lane 4, HAC3; lane 5, HAC4; lane 6, HAC6; lane 7, ATCC 25923; lane 8, UAB1; lane 9, UAB2; lane 10, UAB4; lane 11, UAB5. Each lane contains approximately 50 μg of protein (see Results and Discussion). Stained gels were scanned with an AlphaImager 2000 (Alpha Innotech Corp.) imaging system, and the inverse image was generated with NIH Image software.