<n0:ComplexDefinition xmlns:n0="http://ncicb.nci.nih.gov/xml/owl/EVS/ComplexProperties.xsd#"><n0:def-definition>Heterodimeric glycoprotein Gonadotropin consists of alpha (common)/beta (unique) protein subunits. The alpha subunit is present in other heterodimeric glycoprotein hormones. The beta subunit confers biological specificity and stimulates ovarian synthesis of steroids (progesterone) to maintain pregnancy.</n0:def-definition><n0:def-source>NCI</n0:def-source></n0:ComplexDefinition>