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Recent studies have identified additional cis-acting sequence elements that can either positively or negatively regulate pre-mRNA splicing. Trans-acting protein factors involved in tissue-specific splicing regulation have been characterized. The functions of splicing factors have been explored in vivo and certain splicing factors have been demonstrated to be essential for proper development and cell viability. Kinases that can specifically phosphorylate splicing factors have been identified and phosphorylation has been shown to influence the activity of splicing factors, consistent with a role for phosphorylation in splicing regulation.
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Wang et al. (1997) studied this question.
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