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Pulmonary metastatic ASPS tumor cells express stromal components. The tumor cells, but not the stromal cells, synthesize cygb/STAP and the β subunit of prolyl 4-hydroxylase (P4Hβ) as demonstrated by immunohistochemistry (arrows). CC indicates cancer cells; S, stroma populated with myofibroblasts. Original magnifications: upper panel, x100; lower panel, x400.
