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Using a custom script to process sim4 alignments of cDNA and genomic sequences, we find two to eight different splice forms for 85 (45%) of the 191 genes for which we have had some opportunity to observe alternate splicing (that is, a minimum of two cDNAs, at least one of which is spliced), and 55 (67%) of the 82 genes for which we have four or more cDNAs (and thus a higher chance of observing any alternate splicing) (Figure 5). These alternative splice events are almost all restricted to the 5' UTR and include exon skipping and alternate splice-donor and -acceptor use."}

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{"project":"craft-ca-core-dev","denotations":[{"id":"T5613","span":{"begin":60,"end":69},"obj":"GO:0007608"},{"id":"T5614","span":{"begin":93,"end":113},"obj":"GO:0000380"},{"id":"T5615","span":{"begin":123,"end":144},"obj":"SO:0000445"},{"id":"T5616","span":{"begin":128,"end":138},"obj":"GO:0006412"},{"id":"T5617","span":{"begin":207,"end":214},"obj":"SO:0001026"},{"id":"T5618","span":{"begin":257,"end":263},"obj":"GO:0008380"},{"id":"T5619","span":{"begin":294,"end":299},"obj":"SO:0000704"},{"id":"T5620","span":{"begin":350,"end":368},"obj":"GO:0000380"},{"id":"T5621","span":{"begin":428,"end":435},"obj":"GO:0008380"},{"id":"T5622","span":{"begin":461,"end":466},"obj":"SO:0000704"},{"id":"T5623","span":{"begin":547,"end":565},"obj":"GO:0000380"},{"id":"T5624","span":{"begin":585,"end":603},"obj":"GO:0000380"},{"id":"T5625","span":{"begin":644,"end":650},"obj":"SO:0000204"},{"id":"T5626","span":{"begin":663,"end":667},"obj":"SO:0000147"},{"id":"T5627","span":{"begin":681,"end":697},"obj":"GO:0000380"}],"text":"Our cDNA collection reveals that at least two thirds of the olfactory receptors sampled show alternative splicing of their 5' untranslated exons. Using a custom script to process sim4 alignments of cDNA and genomic sequences, we find two to eight different splice forms for 85 (45%) of the 191 genes for which we have had some opportunity to observe alternate splicing (that is, a minimum of two cDNAs, at least one of which is spliced), and 55 (67%) of the 82 genes for which we have four or more cDNAs (and thus a higher chance of observing any alternate splicing) (Figure 5). These alternative splice events are almost all restricted to the 5' UTR and include exon skipping and alternate splice-donor and -acceptor use."}