Abstract
When chick embryos of 24-72 hrs. and 6 days are ground and injd. into hamsters, antibodies are produced wnich, when placed on preincubated embryos, stops their development at a time which corresponds to the time the embryo antigen was obtained. A high mortality rate results as well as a wide variety of anomalies. The results obtained point to the possibility that there are different protein complexes which make their appearance in the chick embryo concurrent with the embryo''s development.
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