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Fig. 6. Cad39 but not Cad40 localises to podosomes. A7r5 cells expressing EGFP-Cad40 (A-D) or EGFP-Cad39 (E-H) fragments of caldesmon were fixed and stained 48 hours after transfection (A,B,E,F) or stimulated with 1 µM PDBu for 30 minutes prior to fixation (C,G). Cells were stained for EGFP (green) or F-actin (red) and an overlay of the two channels is shown. (A,B) Cad40 disrupted stress fibres in 50% of transfected cells (A), while cells expressing lower levels of Cad40 retained stress fibres (B), which did not contain Cad40. (C,D) Cad40 did not translocate to podosomes induced by PDBu. (D) A reconstruction of the x-z profiles of podosomes from cells in C. (E,F) Cad39 was less disruptive to stress fibres, affecting only 20% of the transfected cells (E) and the majority (80%) of the cells showed little disorganisation of stress fibres (F). Unlike Cad40, Cad39 localised to stress fibres. (G,H) Cad39 co-localised to the core of the podosome. (H) The x-z profiles of podosomes from cells in G. Bars, 20 µm in A-C,E-G; 2 µm in D,H.