Abstract
To identify one kind of proteiin miiolecule as being more primitive than another kind is more difficult than making the same determination for a skeletal structure, because the paleontological record tells us little or nothing about protein molecules. Both the paleontologist and comparative morphologist are concerned with establishing homologies 2 among organisms. They recognize structural similarites on tho basis of comparisons among visible miorphological structures, and almlost all of the taxonomic information on organismis has been accumulated from morphological and paleontological studies. In recent years, however, studies in experilm-ental
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