Distribution of truncated APC proteins. Panels A and B. GFP-APCΔC and GFP-APCΔNΔC localize to both the cortex (arrowheads) and to microtubules (data not shown) in a manner similar to that previously seen for GFP-APC. Panel C. The short C-terminal fragment GFP-APC-C1 has a cytoplasmic localization similar to that seen with GFP alone (data not shown). Panel D. GFP-APC-N localizes to the centrosome (arrow), cytoplasmic puncta and the cortex (arrowheads, additional file 13). Panels E-G. GFP-APC-N expressing cells co-immunostained for the centrosomal marker γ-tubulin show GFP-APC-N localises to the centrosome (arrow). GFP-APC-N green, γ-tubulin red, panel G is a merged image. Panels H-J. GFP-APC-N expressing cells co-immunostained for β-catenin confirm the GFP-APC-N junctional localisation (arrowheads). GFP-APC-N green, β-catenin red. Panel J is a merged image. Bars = 10 μm.