. The beginnings of embryonic development : A symposium organized by the Section on Zoological Sciences of the American Association for the Advancement of Science, cosponsored by the American Society of Zoologists and the Association of Southeastern Biologists, and presented at the Atlanta meeting, December 27, 1955. Embryology. antl-A anti-X antl-B antl-X anti-A antl-Y antl-A-antl-X (antl-AX?) antl-B-anti-X (antl-BX?) antl-A-antl-Y (anti-AY?) Fig. 1. Illustration of the assumption that a particular protein may possess two (or more) kinds of determinant groups, one of which (X) may be present
. The beginnings of embryonic development : A symposium organized by the Section on Zoological Sciences of the American Association for the Advancement of Science, cosponsored by the American Society of Zoologists and the Association of Southeastern Biologists, and presented at the Atlanta meeting, December 27, 1955. Embryology. antl-A anti-X antl-B antl-X anti-A antl-Y antl-A-antl-X (antl-AX?) antl-B-anti-X (antl-BX?) antl-A-antl-Y (anti-AY?) Fig. 1. Illustration of the assumption that a particular protein may possess two (or more) kinds of determinant groups, one of which (X) may be present also on other proteins of the same species of organism and the other of which (A) may be present on the same type of protein in a different species. The types of antibodies that may be expected upon im- munization are listed below each antigen. See text for discussion in rela- tion to cross reactions. of chicken egg-white studied by Cohn, Wetter, and Deutsch (1949), cross-reacting antibodies are obtained. Absorption techniques eliminate to some extent certain of these difficulties. However, it is perhaps important to emphasize that in the use of an antiserum as a test reagent, one does not detect a specific protein or other large molecular substance but rather specific determinant groups. These do not necessarily characterize one particular (chemically defined) protein, and it is also possible that during embiyonic development they may not remain con- tinuously with the same protein. The term antigen is, therefore,. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original American Association for the Advancement of Science. Section on Zoological Sciences; Tyler, Albert, 1906-. Washington
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