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- W1971334905 abstract "In agreement with the clonal theory, one B lymphocyte synthesizes one antibody due to allelic and isotypic exclusion. We analyzed an EBV B-cell clone, E29.1, derived from an 11 week-old embryo, and secreting both IgM kappa and IgM lambda. Structural analysis of produced IgM, indicated that lambda-containing pentamers could be considered hybrid molecules, expressing both the kappa and lambda. chains, with a kappa/lambda ratio between 5 and 10. It was also found that 60% of the lambda chains were secreted in free form, presumably as a result of a better affinity of mu chains for kappa chains. The sequence of the three transcripts had an entirely ORF (Open Reading Frame), and were very close to germline sequences, with, however, an additional codon between V kappa and J kappa gene which has never been described in adult myeloma protein or cDNA human sequence. This observation is suggestive of N diversity taking place in kappa chains. The possible role of Kde (kappa deleting element) recombination onto kappa/lambda locus activation was analyzed on a collection of 23 lambda clones. The status of rearrangement of kappa genes indicated that 35% of these clones had retained, at least, one kappa allele without the Kde recombination, four lambda clones had one kappa allele in germline configuration. Different hypotheses of maturation from pre-B cell to B cell with activation of light chain genes are discussed." @default.
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- W1971334905 date "1992-11-01" @default.
- W1971334905 modified "2023-10-07" @default.
- W1971334905 title "IGMκ/λ EBV human B cell clone: An early step of differentiation of fetal B cells or A distinct B lineage?" @default.
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- W1971334905 doi "https://doi.org/10.1016/0161-5890(92)90173-u" @default.
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