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Diagram to show the possible arrangement of proteins in the transitional junction between fibril and ID. Sarcomeric α-actin is cross-linked by sarcomeric α-actinin, which also binds to ZASP. Beyond this point, the actin isoform changes, possibly to γ-actin. Within the sarcomeric domain titin is present and binds to the transitional junction through its interaction with actin and α-actinin. N-RAP, an actin binding protein is shown as a possible mediator of the transition.
