One gene encodes the heavy chains for three different forms of IgY in the duck.

Abstract excerpt

IgY, the major Ab of the duck (Anas platyrhynchos), exists in two secreted forms and a transmembrane (TM) form. To investigate the genetic relationships of the multiple IgY we cloned the gene encoding the IgY (upsilon) heavy chains. The heavy chain of the smaller (5.7S) IgY, which lacks the third and fourth constant domains, results from the use of a unique terminal exon found in the intron between the second and...

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