Fig. 4. Wild-type Hsp90a rescues thick filament formation in slo^u45 muscle cells whereas Hsp90a^u45 does not. (A-D) Muscle fibres from a slo^u45 mutant (B,D) and wild-type (Sib) (A,C) injected with DNA encoding myc:WTHsp90a double stained for myc (red) and MHC (green). MHC staining in siblings decorates the cells with organised bands (C) indicative of mature A-bands. In the slo^u45 mutant, striations in the MHC staining are only evident in myc+ cells (D). (E,F) Muscle fibres in sibling embryos injected with myc-tagged hsp90a^u45 DNA show organised MHC staining of myc+ cells (E). Myc+ cells in slo^u45 mutants injected with the same construct do not show organised myofibrils (F). Scale bars: 100 µm in A,B; 10 µm in C-F.