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Actinoplanes missouriensis spores swim with a tuft of flagella. Flagella of newborn spores are wrapped with a membranous sheath. When the sheath is unwrapped, spores start swimming. Flagellar length is kept short, at around 1.9 μm, which covers half the circumference of the spore.
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Uchida et al. (2011) studied this question.
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