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Embryonic rat fibroblasts were accumulated in G 1 -phase by incubation in serum-free medium and subsequently stimulated by the addition of calf serum. Using  3 H-inositol and  14 C-choline as label for phospholipids, the following results have been obtained:

zeitschrift für naturforschung c

Stimulierung von Kulturen embryonaler Rattenzellen durch Kälberserum. V. Verhalten der Inosit- und Cholinphospholipide / Stimulation of Embryonic Rat Cells by Calf Serum. V. Metabolism of Inositol- and Choline Phospholipids