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Motility phenotype of algU and mucA mutants. Swimming assays of A. vinelandii wild-type strain ATCC 9046 (WT), algU mutant SMU88, and mucA mutant JRA4, carried out on motility agar plates with BS medium (a) and BB encystment medium (b). (c) Electron micrographs of negatively stained preparations of strains ATCC 9046, SMU88 and JRA4. Bars, 1.0 μm. Cells for transmission electron microscopy were harvested from cultures growing exponentially on BS medium.
