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Fig. 5. Electron micrographs of developing myofibrils. (A) Longitudinal section (LS) of 42 hours APF wild-type myofibrils, seen singly with uniform length sarcomeres demarcated by straight electron dense Z-discs (arrowheads). (B) LS of 46-48 hours APF wild type myofibrils, well-defined sarcomeres are seen (arrowheads to show well-formed, Z-disc demarcated sarcomeres). (C) LS of hdp3 mutant myofibril at 42 hours APF. No myofibrillar or sarcomeric structures are present but larger, stretched and rather bulbous Z-discs (arrow) are seen. (D) LS of hdp3 myofibril at 46-48 hours APF. Myofilaments (now in bundled fibres) show no definite sarcomeric structure or Z-discs (asterisk). Bars, 0.58 µm





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