despite the clear-cut results of the du suppression test , measurement of the deoxythymidine triphosphate ( dttp ) concentration in normal and megaloblastic phytohaemagglutinin stimulated lymphocyte cultures or short-term bone marrow cultures gave no clear-cut differences between normal and megaloblastic cells after addition of deoxyuridine nor did the addition of vitamin b12 , folic acid or folinic acid either alone or with deoxyuridine produce consistent changes in the dttp concentration in lymphocytes or bone marrow cells in megaloblastic anaemia .
C0016410
folic acid
C0023413
folinic acid