Abstract
cations 25 . Of the approximately 120 species and 30 genera currently recognized' 3 - 2 5 , about 37 species and 12 genera regularly nest in eastern North America. This study describes electrophoretically assayed protein variation and differentiation in 28 species representing all of these eastern United States genera. One purpose of this study is to elucidate genetic and systematic relationships among wood warblers. However, the major motivation for this report derives from recent observations in several laboratories that protein evolution in birds appears conservative relative to that of many in
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