Figure 2.

Relationships between alternatively spliced exon. Sections of the Mhc1 genes of Figure 1 have been aligned showing the relationship between the exon-intron structures of the regions containing alternatively spliced exons. Continuous lines connect variants that are almost identical and thus expected to be derived from a common ancestor. Bold lines connecting alternative exons in regions containing multiple variants per Mhc1 gene highlight particularly conserved exons in these sets. Dotted lines represent putative connections between certain variants although their identity is not very strong on the protein level.