| XO female | The genetic female in Turner's syndrome, where the criterion is the macroscopic appearance of the external genitals. (05 Mar 2000) |
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| XO syndrome | <syndrome> A rare genetic disorder (1 in 3,000 births) in women that is characterised by the absence of an X chromosome. This disorder inhibits normal sexual development and causes infertility. Features include webbing of the neck, short stature, retarded development of secondary sex characteristics, absence of menses, coarctation of the aorta, low hairline, eye abnormalities (drooping eyelids) and skeletal deformities. Treatment include oestrogen supplementation at puberty. Growth hormone replacement may be necessary in some cases. Cardiac surgery may be necessary to correct coarctation of the aorta. (27 Sep 1997) |
| Xolloid metalloproteinase | <enzyme> Tolloid-like protein from xenopus with development-regulating activity; acts as a ventralizing agent that mimics low doses of bone morphogenetic protein-4 Registry number: EC 3.4.24.- Synonym: xolloid gene product (26 Jun 1999) |