The effect of removal of 63 cDNAs linked to high exonuclease activity to the frequency of IGHD segments in bovine fetal immunoglobulin cDNAs.

Exonuclease activity was deduced from the alignments with the best matching IGHD segment and quantified by the number of apparently excised nucleotides. High exonuclease activity: excision of over 29 nucleotides from either end of the IGHD segment.