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Immobilized cells of E. coli viewed for 1 s. (A and B) Labeled with Oregon Green 514 and illuminated by a mercury arc. (C and D) Labeled with Alexa Fluor 532 and illuminated by a strobed argon-ion laser (the technique used for all subsequent figures). The waveforms exhibited by individual filaments include normal (A); normal, semicoiled, and curly 1 (B); and normal, curly 1, and curly 2 (C and D).
