Figure 1. Partial restriction map of the λ phage and location of the PMEU1 genomic sequence. Open box, black box and gray box represent the PMEU1 promoter, genomic DNA coding region, and the phage DNA region flanking the 3´ end of pmeu1 gene. Right and left represent the right (8.8 kb) and left (19.9 kb) lambda arms. Abbreviations: B, E, H,P, and S indicate BamHI, EcoR I, Hind III, Pst I and Sal I restriction sites. Sal I sites at the left and right borders are from the λ EMBL3A.