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Domain structure and transcript diversity of plectin.

Plectin, a cytoskeleton-associated protein of exceptionally large size, is abundantly expressed in a wide variety of mammalian tissues and cell types. It is codistributed with different types of intermediate filaments (IFs) and is prominently located at the plasma membrane attachment sites of IFs and of microfilaments, such as hemidesmosomes (Wiche et al., 1984), Z-line structures and dense plaques of striated and smooth muscle (Wiche et al., 1983), intercalated discs of cardiac muscle (Zerig and Wiche, 1985), and focal contacts (Seifert et al., 1992). Furthermore, in several tissues, including brain (Errante et al., 1994) and kidney (Yaoita et al., 1996), plectin expression is prominent in cells forming tissue layers at the interface of tissue and fluid-filled cavities. These observations are consistent with a model in which the role