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PE has been used in IF:
Irvine DJ & Davis MM, 2002,
Direct observation of ligand recognition by T cells.
They actually used PE to perform single molecule detection.
-Steve Bunnell
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Stephen C. Bunnell, Ph.D.
Assistant Professor
Tufts University Medical School
Department of Pathology
Jaharis Bldg., Room 512
150 Harrison Ave.
Boston, MA 02111