Deletion of a B-cell-specific enhancer affects transfected, but not endogenous, immunoglobulin heavy-chain gene expression.
Zaller DM, Eckhardt LA. Deletion of a B-cell-specific enhancer affects transfected, but not endogenous, immunoglobulin heavy-chain gene expression. Proc Natl Acad Sci U S A. 1985 Aug; 82(15):5088-92.