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Proceedings of the National Academy of Sciences of the United States of America logoLink to Proceedings of the National Academy of Sciences of the United States of America
. 1917 Feb;3(2):73–78. doi: 10.1073/pnas.3.2.73

The Lips and the Nasal Apertures in the Gnathostome Fishes, and Their Homologues in the Higher Vertebrates

Edward Phelps Allis Jr 1
PMCID: PMC1091179  PMID: 16586700

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