of the different substances infused into the smnall intestine , free nucleic acids were removed to extents greater than 97 % , adenine , guanine and uracil had completely disappreaed , thymine and xanthine to approximately 80 % and 95 % and hypoxanthine and cytosine to only 51 % and 48 % respectively .
C0041917
uracil
C0040087
thymine