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Article Takedown/Update Request

This is an update request for the document T cell positive selection by a high density, low affinity ligand by Chih-Pin Liu, Frances Crawford, Philippa Marrack and John Kappler

Your paper was deposited in PubMed Central and appears online at http://www.pubmedcentral.nih.gov/articlerender.fcgi?artid=22522
Before we are able to make any updates or deletions, you must ensure that the original record at this location is updated/removed.