Studies in congenital porphyria. 2. Incorporation of 15N in the stercobilin in the normal and in the porphyric

INCORPORATION OF -15N INTO COPROPORPHYRIN ETC. 87 found in normals by Shemin & Rittenberg (1946) and London et al. (1949). This would indicate that the turnover rate of the glycine 'pool' is greater in the porphyric than has been found so far in normal sub- jects.