Table 1.

Conserved RNA elements recognized by the splicing machinery.

Splice Sites	Nucleotides
5’ splice site	CAG/GUAAGU
Branch point sequence	YUNAY
Polypyrimidine tract	Yn
3’ splice site	NYAG/G

Y = C/U; N = any nucleotide; “n” = number of pyrimidine constituting the polypyrimidine tract.