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From Molecular Biology of the Cell (4th edition) by Bruce Alberts et al. (Chp 6, Pg 338) :

Both bacterial and eucaryotic tRNAs are typically synthesized as larger precursor tRNAs, and these are then trimmed to produce the mature tRNA. In addition, some tRNA precursors (from both bacteria and eucaryotes) contain introns that must be spliced out.

What's the difference between the two statements (and between trimming and splicing) ?

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Trimming = removing RNA sequences from one end.

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Splicing = removing introns and joining exons back together.

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