ResearchersfromWashingtonUniversityinSt.Louisfoundthat,whilerapidlydividingyetaberrantstemcellsareamajorsourceofcancer,maturecellsalsoplayakeyroleininitiatingca
New pill-sized robots that patients swallow to perform endoscopies, or examinations of the digestive tract, have been put into use in more than 100 Chinese hospitals.