Canine colostrum was examined for its content of immunoglobulins, in particular IgA and 7Sγ1, which were isolated. The IgA immunoglobulin was characterized to a limited extent. 7Sγ1 is present in significant amounts in colostrum and is distinctly different from the IgA in colostrum and serum. Whereas 7Sγ1 previously was thought to be a separate immunoglobulin class, it now appears to be related to the IgG class through heavy chain determinants and may be an IgG subclass.

*

Follows IV, Copro-Immunoglobulins, which appears on page 888.

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Copyright, 1970, by The Williams & Wilkins Company
Copyright © 1970 by The American Association of Immunologists, Inc.
1970
The Williams & Wilkins Company