Until some years ago serum or crude tissue extracts were used pre dominantly or exclusively as media supplements for the cultivation of cells. However, during this time evidence accumulated that these sup plements could not provide in an optimal way most of the cultivated cells with all factors necessary for their survival, their prolifer ation and/or differentiation. Moreover, a variety of cells could not be cultivated at all under these conditions and often the composition of the cultures changed within rather short periods of time by overgrowth of initially present subpopulations of those...
Until some years ago serum or crude tissue extracts were used pre dominantly or exclusively as media supplements for the cultivation of cells. However...