MAO A and B genes are located on the X chromosome ( Xp11 23 ) and consist of 15 exons with identical intron exon organization , which suggests that they are derived from the same ancestral gene .
单胺氧化酶A和B的基因定位于X染色体（Xp1123），都由15个外显子组成，而且它们的内含子外显子组织是完全一致的。
xp11