unmetabolized fura ( not detected in the absence of thymine or uracil ) was detected intracellularly in the presence of thymine or uracil and was accompanied by the appearance of a novel metabolite , preliminarily identified as a glucuronide of the fura base which reached intracellular levels of 44 +/- 9.76 and 27.45 +/- 1.35 microm in the presence of thymine or uracil , respectively , within 1 hr .
C0040087
thymine
C0041917
uracil