'All of the following proteins may be found in the extracellular matrix of animal cells EXCEPT actin proteins since all other proteins are found in the extracellular matrix of animal cells (Option A).
The actin protein is a fundamental protein in diverse cells but especially in the muscle cells because they are linked to myosin to produce contraction in these types of cells in response to environmental stimuli associated also with the nerve system.
Moreover, the actin protein is also involved in the formation of the cytoskeleton which is a rigid structure that provides support to all cells in animals.
Therefore, with this data, we can see that the actin protein is a key component of the cytoskeleton and also muscle cells but this protein is not found in the extracellular matrix that surrounds the cell in animals.
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