Focal laminate segments in cytoplasmic processes of mouse myocardial fibroblasts

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Abstract
In mouse ventricular myocardium, we have found unusual fibroblasts whose cellular processes in some regions are particularly flattened and which contain linearly‐arranged, electron‐opaque structures (“central laminae”). The morphology of these focal laminate segments of fibroblast processes suggests that the intracellular laminae are adhesive entitieswhich hold the plasmalemmata above and below them in close parallel apposition for short distances.