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<p>If the U4 snRNA is degraded and thereby removed from the spliceosome, splicing is effectively halted. The U4 and U6 snRNAs are demonstratively required for splicing <a href="page.php?w=in_vitro">in vitro</a>.</p>

<p><big>Structure</big></p>
<p><a href="page.php?w=image%3AU4uglynakedtemp.jpg">left</a><a href="page.php?w=image%3AYeastU4U6other.jpg">right</a>The U4 snRNA secondary structure is suggested to alter depending on its interaction with the U6 snRNA. Several experiments involving <a href="page.php?w=X-ray_crystallography">X-ray crystallography</a>,</p><p>
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