title: Departing is such sweet sorrow.
authors: Amgen Inc, Thousand Oaks, California, 91320, USA. amoore@amgen.com
authors: A J
authors: AJ
authors: Moore
authors: A J
authors: AJ
authors: Butt
authors: H M
authors: HM
authors: Beere
mesh_terms: D000818:Animals; D017209:Apoptosis / Q000502:physiology*; D006801:Humans; D008954:Models, Biological; D015398:Signal Transduction