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a CD56 immunostaining in a solid variant ARMS of the ethmoid sinus. b and c Synaptophysin and cytokeratin immunostaining, respectively in an ARMS of the nasopharynx. dSplit red and green signals indicative of a FOXO1 rearrangement characteristic of ARMS are identified by interphase FISH analysis with a FOXO1 breakapart probe (bottom left). PAX7-FOXO1 and PAX3-FOXO1 fusion transcripts identified by RT-PCR analysis (bottom right)
