![]() One cell can even change which type of intermediate filament protein is expressed over its lifetime. Cells in different tissues of the body express one or another of these genes at different times. They are encoded by a large number of different genes and can be grouped into families based on their amino acid sequences. Intermediate filaments are found only in complex multicellular organisms. As a result, the overall filament has no polarity, and therefore no motor proteins move along intermediate filaments. The subunits of intermediate filaments are elongated, not globular, and are associated in an antipolar manner. Intermediate filaments are so named because they are thicker than actin filaments and thinner than microtubules or muscle myosin filaments. SpaceNext50 Britannica presents SpaceNext50, From the race to the Moon to space stewardship, we explore a wide range of subjects that feed our curiosity about space!.Learn about the major environmental problems facing our planet and what can be done about them! Saving Earth Britannica Presents Earth’s To-Do List for the 21st Century.Britannica Beyond We’ve created a new place where questions are at the center of learning.100 Women Britannica celebrates the centennial of the Nineteenth Amendment, highlighting suffragists and history-making politicians.COVID-19 Portal While this global health crisis continues to evolve, it can be useful to look to past pandemics to better understand how to respond today. ![]() Student Portal Britannica is the ultimate student resource for key school subjects like history, government, literature, and more. ![]()
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