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The unique species of rat bred by University of Pennsylvania biologists catapulted the Levittown hill to fame in the 1930s.

Effingham morrisGary james hoffmanCaspar wistarHelen dean kingIsaac jones wistarElizabeth myersGary james hoffmannMary anneDonna myers bauerDennis bauerCedar hillCarl laWistar institute of anatomyUniversity of pennsylvaniaWistar ratsRed cedar hill