<n0:ComplexDefinition xmlns:n0="http://ncicb.nci.nih.gov/xml/owl/EVS/ComplexProperties.xsd#"><n0:def-definition>The maturation and propagation of spermatozoa. The process consists of three phases, mitosis, meiosis, and spermiogenesis. This results in a specialized cell that is capable of traversing the male and female reproductive tracts, and has the capability of fertilizing an egg.</n0:def-definition><n0:def-source>NCI</n0:def-source></n0:ComplexDefinition>