| arrowhead | 1. <botany> An aquatic plant of the genus Sagittaria, especially. S. Sagittifolia, named from the shape of the leaves. 2. <cell biology> Fanciful description given to the pattern of myosin molecules attached to a filament of F actin. Easier to see if tannic acid is added to the fixative. The arrowheads indicate the polarity of the filament, the barbed (attachment) end is the site of major subunit addition. (18 Nov 1997) |
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| arrowhead | the pointed head or striking tip of an arrow |
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