text: In genetics,<unk> is a modification of genetic information after transcription, in which introns of precursor messenger RNA (pre-mRNA) are removed and exons of it are joined. Since in prokaryotic genomes introns do not exist,<unk> naturally only occurs in eukaryotes. The<unk> prepares the pre-mRNA to produce the mature messenger RNA (mRNA), which then undergoes translation as part of the protein synthesis to produce proteins.<unk> includes a series of biochemical reactions, which are catalyzed by the spliceosome, a complex of small nuclear ribonucleo-proteins (snRNPs).
option_0: Splicing 
option_1: Amplification 
option_2: Self-replication
option_3: Thermal depolymerization
option_4: Reverse transcription
option_5: Chemical modification
option_6: Dimroth rearrangement
option_7: Polymerization