IgD

A. Structural properties (see Table 3-1). The structural formula for IgD is 82k2 or 52A,2.

B. Functional properties (see Table 3-2)

1. Serum half-life and concentration. IgD is found on the membranes of 15% of newborns and 5% of adult peripheral blood lymphocytes in conjunction with IgM; serum levels are very low. The serum half-life is 2 to 3 days.

2. Functions. IgD is a major receptor on B cells for antigen.

I. OVEF

ch m pa of

III. AGGL

antigei

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