Examples of loci. (a) Locus 1 from Arabidopsis, (b) Locus 2 from Hordeum, (c) Locus 3 from Arabidopsis. PEP-promoters are designated with P, NEP-promoters - with N; T1 and T2 are predicted terminators. Positions of transcription initiation sites are given relative to start codons of the corresponding genes. DNA strand containing the promoter and the gene is marked with arrow and color, respectively.