| 21. | The GAS5 introns host several snoRNA sequences, including SNORD74.
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| 22. | Unusually, faustovirus genes have been shown to contain introns.
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| 23. | The herringbone regions between the vertical bars are introns.
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| 24. | A similar drug, Peg-Intron, went on sale last year.
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| 25. | Schering-Plough Corp . makes Peg-Intron.
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| 26. | Biological factors also influence which genes in a genome lose or accumulate introns.
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| 27. | Each intron has GU at its 5'end.
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| 28. | SR proteins recognize intron and exon enhancers and silencers.
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| 29. | Comparison of introns 1 and 2 also yielded high homology of conserved segments.
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| 30. | The consensus polypeptide chain is ( typical intron position noted with dashes ):
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