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URL: http://scholar.google.com/scholar_lookup?title=Polyclonal+B-cell+activation+%28PBA%29.+What+have+we+learned+from+the+study+of+malaria%3F&year=1988&author=Daniel+Ribeiro&journal=Mem+Inst+Oswaldo+Cruz&volume=83+Suppl+1&pages=633-648&pmid=3075697