Bundling of actin filaments by alpha-actinin depends on its molecular length.

Therefore, we feel that while the mean lengths we have determined for the different c~-actinin isoforms may not necessarily repre- sent their absolute values, the relative length differences are likely to be significant since they are based upon common preparation and evaluation protocols.

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While the relative polarities were different for different c~-actinin isoforms, in no case were they random but revealed a clear trend for each isoform, i.e., antiparallel for smooth muscle and Dictyosteliumc~-actinin, and parallel for Acanthamoeba~-actinin (Table I).

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