Genomic organization of BGRF1, BERF1, and BEIL1 genes. The reconstructed BGRF1 gene includes a transcribed region of 3,613 bp with four exons and three introns. The BERF1 gene is organized in a transcribed region of 2,227 bp consisting of four exons and three introns. The BEIL1 gene includes a transcribed region composed of three exons (3,256 bp) and two introns (in the 5′ and 3′ untranslated regions). White boxes, thick lines, and thin lines represent exons, introns, and 5′ and 3′ genomic regions (identified from barley genomic clones), respectively. The positions of start and stop codons are indicated. The putative start of transcription is indicated based on the longest available cDNA clones.