Figure 3.

Molecular map of the GL1 locus. Exon sequences (top line) together with interspersing intron sequences (middle and bottom lines) are reported. The approximate position of insertion sites of En/Spm transposable element sequences present in gl1 mutable alleles (m1–m9) is indicated with arrowheads indicating transposable element orientation. ATG start and TGA stop codons, as well as restriction sites of the ApaI (A), BamHI (B), HindIII (H), KpnI (K), SalI (Sa), SpeI (Sp), and SstI (Ss) endonucleases are reported. DNA segments used as molecular probes in Southern analyses are indicated and marked I, III, and IV. Probe II, consisting of an SstI (intron 3)-SstI (intron 4) fragment, is not indicated.