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Transverse section through a microchaete from a mutant containing a wild-type (2×) number of fascin genes but an excess (6×) of forked genes. Of interest is that the membrane-associated actin bundles are triangular in shape. Nearby these bundles, arrowheads indicate many small internal bundles. The filaments in all bundles are hexagonally packed (see insets) and show a 12-nm period in longitudinal section (data not shown).
