Chen, Su-Feng Nonadhesive culture system as a model of rapid sphere formation with cancer stem cell properties. [electronic resource] - PloS one 2012 - e31864 p. digital Publication Type: Journal Article; Research Support, Non-U.S. Gov't ISSN: 1932-6203 Standard No.: 10.1371/journal.pone.0031864 doi Subjects--Topical Terms: Carcinoma, Squamous Cell--pathologyCell Culture Techniques--methodsCell SeparationHumansNeoplastic Stem Cells--cytologySpheroids, CellularTumor Cells, Cultured