snRNPs in splicing
•                 Donor site                 Branchpoint       Acceptor
site
• [----Exon----]GU----------------------A-----(Py)n--AG[----
Exon----]
• U1 SnRNP recognises donor site by direct base pairing.
• U2 SnRNP recognises branch point by direct base pairing
and subsequently also base pairs at the 5' end of the intron.
• U4&U6 (base paired together) are both in same SnRNP.
U6 base pairs with U2.
• U5 SnRNP interacts with both donor and acceptor sites by
base pairing, bringing together 2 exons.