Figure 1.
Partial structural map of the monoamine oxidase (MAO) A and B genes showing the location of exons. (Filled bars) Coding regions; (unfilled bars) untranslated regions of the exons. Exon numbers are below the bars. (horizontal arrows) The regions sequenced; (vertical arrows) equivocal assignment of an exon to either restriction fragment. The prefix “λ,” λ bacteriophage clones; the prefix “p,” pUC19 subclones of λ phage DNA; E, EcoRI restriction site; H, HindIII restriction site;//, intron gap. (From Grimsby et al 1991.)