Large pre-B cells are characterized by which of the following?
a. They do not express CD19 at the cell surface.
b. Rearrangement of light-chain genes commences.
c. Nonproductive rearrangement of both heavy-chain loci has already occurred.
d. Allelic exclusion of the immunoglobulin light-chain loci has already occurred.
e. ? is assembled with VpreB?5.
E
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Fill in the blank(s) with correct word
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