slow precipitation of rna-free myosin by dialysis yields very long filaments or ribbons ( greater than 5 micrometer , 30 -- 60 nm wide ) in which the myosin may be packed diagonally across the filament , similar to the `` '' side-polar '' '' aggregates formed by other nonmuscle myosins and by smooth muscle myosin ( craig r , megerman j : j cell biol 75:990 , 1977 ;
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filament
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j ce