T tubules are invaginations of muscle cell plasma membrane.
These images were provided by Terrence Wagenknecht of the Wadsworth Center, NY State Department of Health. The activated calmodulin wraps around the target domain of a calmodulin-sensitive protein. Met residues, in each of the two major domains of calmodulin, participate in binding to hydrophobic residues in target domains of enzymes, such as kinases, that are regulated by calmodulin. Copyright 1998-2001 by Joyce J. Diwan. All rights reserved.