Radiochromatography of 5-3H-uridine derivatives found in trichloracetic and soluble fractions of mouse brain, liver, muscle and blood.

Trichloracetic acid soluble fractions from the mouse brain, liver, muscle and blood were chromatographed in three solvent systems after a subcutaneous injection of 5-3H-uridine (boric acid -- ethanol -- water -- ammonium hydroxide; n-butanol -- acetic acid -- water; IM ammonium acetate -- 95% ethanol). The amount of uridine converted to uracil in the brain and blood highly prevailed over that phosphorylated to UMP. On the contrary, the amount of 3H-;uracil was small in the LIVER AND MUSCLe, the majority of 3H-uridine being converted to UMP.