单词	microvillus
释义	microvillus /ˌmʌɪkrəʊˈvɪləs / noun (plural microvilli /ˌmʌɪkrəʊˈvɪlʌɪ/ /ˌmʌɪkrəʊˈvɪliː/) Biology Each of a large number of minute projections from the surface of some cells.The diagnosis was confirmed by the ultrastructural demonstration of large desmosomes and long microvilli at the cell surface.... The luminal surface of the epithelial cells contained few irregular cytoplasmic projections, but cilia or microvilli were absent. These cells are sparse but are easily distinguished from other epithelial cells by the presence of a tuft of blunt, squat microvilli on the cell surface. Derivatives microvillar adjective ... The underlying epithelial cells show irregular light nuclei containing discrete nucleoli and a microvillar layer that is presumably secreting the basal layer of cuticle (arrow). Equally a mystery are the mechanisms responsible for the construction and destruction of the microvillar membrane with changes in microvillus length. As the core filaments polymerize, other microvillar proteins (villin, fimbrin, etc.) are mobilized from the cytoplasm and inserted.
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