Splicing activity is a function of:
High-Yield Explanation
Small Nuclear RNA (SnRNA):
They belong to small RNAs of size 90 to 300 nucleotides
1% of total RNAs
They have ribozyme activity.
Function
mRNA Processing (U1, U2, U4,U5, U6 and U7 as a part of spliceosome)
rRNA processing
Gene regulation.
Harper 30th edition Pg-408,411