HomeThe liquid overlay technique is the key to formation of co-culture spheroids consisting of primary osteoblasts, fibroblasts and endothelial cells August 24, 2011 print this article The liquid overlay technique is the key to formation of co-culture spheroids consisting of primary osteoblasts, fibroblasts and endothelial cells Metzger et al.; Cytotherapy. 2011 Sep;13(8):1000-12