<n0:ComplexDefinition xmlns:n0="http://ncicb.nci.nih.gov/xml/owl/EVS/ComplexProperties.xsd#"><n0:def-definition>The cellular and vascular changes occurring in the endometrium at the time of implantation.</n0:def-definition><n0:def-source>NCI</n0:def-source><n0:attr>On-line Medical Dictionary</n0:attr></n0:ComplexDefinition>