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Light-microscopy images showing the effect of rChymotrypsin, proteinase K, and sodium meta-periodate on preformed S. epidermidis 1457 (a to d), S. epidermidis 5179-R1 (e to h), and S. aureus SA113 (i to l) biofilms. (a, e, and i) Untreated bacteria, controls; (b, f, and j) 10 μg/ml rChymotrypsin; (c, g, and k) proteinase K; (d, h, and l) sodium meta-periodate. Bar = 10 μm.
