Figure 1

Structure of the Pain-1 locus on potato chromosome III ( A ) and the Inv-ap-a locus on chromosome X ( B ). Annotated open reading frames (ORFs) are numbered as in Table S1 in additional file 5. Transcriptional orientation is indicated by arrowheads. Left to right transcripts are shown in black, right to left transcripts in grey. The intron/exon structures of Pain-1 (ORF 6 on BAC BC149o15), InvCD111 and InvCD141 (ORFs 3 and 4 on BAC BC163l15) are shown as blow-ups.