title: Scientific discovery, hypothesis testing and two current opinions, with two opinions.
authors.forename: D Michael
authors.initials: DM
authors.lastname: Nelson
authors.forename: Graham J
authors.initials: GJ
authors.lastname: Burton
mesh_terms: D035843:Biomedical Research / Q000379:methods*; D053181:Caspase 8 / Q000378:metabolism*; D002454:Cell Differentiation; D002459:Cell Fusion; D005260:Female; D006801:Humans; D010920:Placenta / Q000201:enzymology; D011247:Pregnancy; D012107:Research Design; D014327:Trophoblasts / Q000166:cytology* / Q000502:physiology
chemical_list: D053181:Caspase 8