Hamilton’s rule:  It states that an allele that causes an altruistic behavior will spread if the following condition is met (rb>C)

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Integrins have an important function in neuroregeneration after injury of the peripheral nervous system.

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Three major classes of animal-cell junctions: 

1. Anchoring junctions

2. Tight junctions

3. Gap junctions

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Adherens junctions 

Adhesion type- Cell-cell

Principal CAMs- Cadherins

Cytoskeletal attachment- Actin filament

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Adherens junctions

functions as a tension cable that can internally brace the cell and thereby control its shape

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Desmosomes

Adhesion type- Cell-cell

Cytoskeletal attachment- Intermediate filaments

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The key CAMs in desmosomes are the desmosomal cadherins, desmoglein and desmocollin