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Fig. 7. Reducing acto-myosin force suppresses hdp³ fibre hypercontraction. Polarised light micrograph hemithoraces of (A) hdp³, with no IFM and TDT is visible [asterisk shows where IFM and TDT are normally present (compare to Fig. 6A)], (B) hdp³/Y; Mhc¹⁰/+, Y97, with only a small bunch of muscle mass visible (arrow), (C) hdp³/Y; Mhc¹⁰/+, Y97/Y97, with increased muscle mass (arrow) and (D) hdp³/Y; Mhc¹⁰/Mhc¹⁰, Y97/Y97, where muscle fibres are present comparable with the Mhc¹⁰/Mhc¹⁰, Y97/Y97 genotype (not shown), in which fibres extend the length of the thorax. The star indicates a DLM; thinned fibre ends (arrowheads) are still visible. Anterior to left; dorsal to top in all the figures. Bars, 0.138 mm (A-D). Electron micrographs of LS of (E) hdp³/Y; Mhc⁷/Mhc^P401S IFM to show presence of Z-discs (absent in hdp³ homozygotes) showing the presence of `tiger-tail' assemblies (arrowheads) and thick filaments (arrows), and (F) hdp³; Mhc¹⁰; Y97 IFM to illustrate the increased number of thick filaments (arrows), scant thin filaments and Z-disc like bodies (arrowheads), although these are associated with only very small amounts of short thin filaments. Bars, 0.5 µm (E-F).

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