"ABC Commercial." . . . . . . "Documentary films"@en . . . "Aussie scientist Barry Marshall won the Nobel Prize for discovering the bacterial cause of stomach ulcers. But he also proposed that he could tell where you were born and where your family comes from by the DNA of your helicobacter. Given that half the world's population carry helicobacter, it could be a useful way of researching human migration."@en . "Bacterial migration"@en . "Stomach Ulcers." . . . .