How do small RNAs in the spliceosome initiate the splicing of the pre-mRNA?

Name: How do small RNAs in the spliceosome initiate the splicing of the pre-mRNA?
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Small RNAs in the spliceosome, called small nuclear RNAs (snRNAs), base pair with specific sites along the intron to form a complex with proteins, forming the spliceosome. This initiates the splicing process, by bringing together the two exons on either side of the intron and catalyzing the formation of a phosphodiester bond between them.

How Do Small RNAs in the Spliceosome Initiate the Splicing