[Growth-stimulating effect of serum ultrafiltrates on BHK-21 cells].

The growth of BHK-21 cells exposed to various bovine serum ultrafiltrates has been studied. The intensity of cell multiplication equal to that seen in the presence of the whole serum was provided only by the ultra filtrate containing all components with molecular weights up to 200 000 dalton. Ultrafiltrates containing components with molecular weight up to 70 000 dalton or from 70 000 to 200 000 dalton provided stretching of cells and their partial multiplication. Ultrafiltrates containing components with molecular weight up to 14 000 dalton stimulated only attachment of cells, without stretching.