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Fig. 2. Dark-field micrographs of flagella treated with PRODAN-UV `locally' in the
presence of ATP and trypsin. Limited disintegration of flagella was observed
in the region without PRODAN-UV treatment. (A) Basal region of the flagellum
treated with PRODAN-UV (the region between two arrowheads). (B) Distal region
of a flagellum treated with PRODAN-UV (the region between two arrowheads). The
arrow marks microtubules that came out loose.