In the photo, the embryonic stem cell colonies are the rounded, dense masses of cells. (science.howstuffworks.com)
We replated cells on to a feeder cell layer and analyzed the formation of stem cell colonies fourteen days later by staining for expression of GCTM - 2 (Figure 4a, colony morphologies). (journals.plos.org)
Overall stem cell colony formation efficiency following single cell isolation and flow cytometry was still quite low (∼ 0.5 %) despite the use of the Rho - associated kinase inhibitor but consistent results were obtained. (journals.plos.org)