Figure 5.

Diagram of the arthropod Mhc1 proteins. The exon-intron structure of the Mhc1 genes is shown based on the protein sequence. Exons are shown as boxes while introns are represented by spaces. The same colour scheme has been used as in Figure 1. Numbers on alternative exons denote the number of variants. The exons are drawn that the intron positions align between the different Mhc1 genes. Thus, the exon lengths are not drawn to scale (e.g. the exons encoding the variable loop-2 are different in lengths). On the right side, the protein sequence of Drosophila melanogaster Mhc1 is shown as reference. Dotted lines connect amino acids that are derived from split codons.