Rat liver plasma membranes contain relatively high amounts of EGTA-insensitive calmodulin which seems to interact with cytoskeletal proteins. Calmodulin is particularly enriched in a subplasmamembrane fraction containing basolateral membranes. Two calmodulin-binding proteins with apparent Mr of 240 KDa and 145 KDa have been found associated with the purified plasmamembranes.
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