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Dogs have ear mobility that allows them to rapidly pinpoint the exact location of a sound. Eighteen or more muscles can tilt, rotate, raise, or lower a dog's ear. A dog can identify a sound's location much faster than a human can, as well as hear sounds at four times the distance. [41] Dogs can lose their hearing from age or an ear infection. [42]
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Cell shape changes as a function of mitotic phase.Shown is an example of a HeLa cell cultured on a glass surface. For visualization of DNA and mitotic phase assignment, the cell expresses Histone H2B-GFP to provide fluorescent labeling of chromosomes.
As the aristocracy often used hunting dogs, dogs were shown as symbols in heraldry. In the late Middle Ages and the Renaissance, heraldry became a highly developed discipline. Dogs of various types, and occasionally of specific breeds, occur as charges and supporters in many coats of arms, and often symbolise courage, vigilance, loyalty, and ...
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Epithelial cells in culture grow normally as tight clusters. However, they could be induced to break cell-cell contacts and become elongated and motile after exposure to a "scatter factor" that was secreted by mesenchymal cells such as Swiss 3T3 fibroblasts. [12] This was best described by Julia Gray's group in 1987. [13]
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