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Phosphorylation of Trask in tumor cells detaching into the luminal space of a tubular adenoma. A section of tubular adenoma was stained by immunohistochemistry using anti-p-Trask antibodies, revealing frequent nonphysiological phosphorylation of Trask and tumor cell shedding in this tumor. For further details, please see the article by Wong and colleagues 2311 of this issue.