I wonder do the genes have the same exon-intron junction sequences or do they have different junction sequences? I was told that all genes have this general junction sequences of the exon-intron-exon: 5'---exon---A/CG-><-GUPuAGU----intron-----Py12NPyAG-><-G---exon---3' The arrows indicate the borders/junctions of exons and intron. When this intron is cut out and the exons are united we would have this exon-exon sequence: 5'---exon---A/CG-><-G---exon---3'. How can i check which sequences are exon-intron junctions and which are not? Thanks.