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J. Exp. Med.,
Volume 187, Number 2, January 19, 1998 259-264
By

From the * Institute for Cancer Research, Fox Chase Cancer Center, Philadelphia, Pennsylvania
19111; and the The expression of different sets of immunoglobulin specificities by fetal and adult B lymphocytes is a long-standing puzzle in immunology. Recently it has become clear that production of immunoglobulin µ heavy chain and subsequent assembly with a surrogate light chain to form
the pre-B cell receptor complex is critical for development of B cells. Here we show that instead of promoting pre-B cell progression as in adult bone marrow, this complex inhibits pre-B
cell growth in fetal liver. Curiously, we identify a fetal-associated VH11 µ heavy chain that allows continued pre-B proliferation in fetal liver. Interestingly, this heavy chain does not associate efficiently with a surrogate light chain, providing a previously unrecognized mechanism for
skewing the expression of distinctive VH genes toward fetal through early neonatal life.
Kimmel Cancer Institute, Thomas Jefferson Medical College, Philadelphia,
Pennsylvania 19107
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