Abstract
Projectin is a giant filamentous protein of arthropod striated muscle. By using immunofluorescence microscopy, projectin was shown to span between the I band and the A band in locust ( Locusta migratoria) flight muscle sarcomeres. The N- and C-terminal regions of projectin molecules were localized in the I band and A band, respectively. This observation explains the controversial reports of previous studies that projectin is localized either in the I band or in the A band of locust flight muscle sarcomeres. It is also observed that the N-terminal region of projectin is located in the I band of locust leg muscle sarcomeres.
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