/newsroom/ en /newsroom/news/list/2024/07/23/monotremes-are-unique-inside-and-out The identification of a key gene in monotremes has increased our understanding of why the stomachs of platypuses and echidnas are atypically small, non-acidic, and, in the instance of platypuses, lack a pyloric sphincter. July 23 2024 Johnny von Einem /newsroom/news/list/2024/07/23/monotremes-are-unique-inside-and-out