end, weeks post birth true Count of number of weeks intervening between the end of the stage and the time of birth according to a reference model. Note that the first week of post-birth development has the value of 1 for this property, and the period during which the mouse is one week old has the value 2 mouse_stages_ontology This is a shortcut annotation that can be expanded to an OWL axiom, or to a set of OWL axioms. The exact translation has yet to be determined, and may be application-dependent. end_wpb