Müller FJ, Goldmann J, Löser P, Loring JF (2010): A Call to Standardize Teratoma Assays Used to Define Human Pluripotent Cell Lines
Cell Stem Cell 6 (5): 412-414. http://www.cell.com/cell-stem-cell/abstract/S1934-5909(10)00164-5.

The teratoma assay is the gold standard for documenting pluripotency of human stem cells. However, reports of new human ESC and iPSC lines vary widely in both methods and analysis of teratoma data. We call for consensus standards to be established to make this assay worthy of its “golden” status.