| 21. | It has also proved difficult to produce a detailed classification within the living chordates.
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| 22. | The mycobacterial arabinogalactan is recognized by a putative immune lectin intelectin present in chordates.
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| 23. | Is it known what the primitive state of this ability in early chordates was?
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| 24. | FAM76A is conserved in most chordates but is not found in other regulating transcription.
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| 25. | Previous generations of scientists had thought that chordates evolved in the later Ordovician geological period.
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| 26. | The identification of the new specimen as a chordate will be controversial, scientists said.
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| 27. | On the basis of these findings, they constructed a new scenario for chordate evolution.
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| 28. | In the early embryonic stage, it looks like the hollow nerve cord of chordates.
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| 29. | If the ancestral chordates had perished, creatures with central nervous systems might never have developed.
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| 30. | In some chordates, it persists throughout life as the main ventral to the neural tube.
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