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Fig. 6. Termination of myofibrillar tips within the nuclei and existence of microtubules in the nuclear invaginations. (A) Termination of myofibrillar tips within the nuclei. A differential interference contrast (DIC) image (a), corresponding rhodamine-phalloidin staining (b), and an immunofluorescent image detecting sarcomeric MyHC (c). Arrows indicate the tip of a premyofibril within the nucleus. (B) Existence of microtubules in the nuclear invaginations. A DIC image (a), corresponding rhodamine-phalloidin staining (b), and an immunofluorescent image detecting ß-tubulin (c). Arrows indicate the nuclear invaginations containing premyofibrils and microtubules. Bar, 20 µm.