RISH analysis of HOXC5 on a nodal (a) and cutaneous (c) ALCL. A double staining for HOXC5 using RISH (green) and CD30 using immunohistochemistry (red) of a nodal ALCL (case no. 36) is shown in (a) and a hematoxlin and eosin staining of this lymphoma is shown in (b). Positive signals are shown as black DAB/Ni precipitates in (c), and sense control is shown in (d).