as a consequence of this secondary control , there is excessive excretion of the porphyrin precursors delta-aminolaevulinic acid and porphobilinogen in the acute porphyrias and excessive excretion of porphyrins leading to solar photosensitivity in the non-acute porphyrias and in variegate and hereditary coproporphyria .
C2917401
porphyrin precursors
C0002563
delta-aminolaevulinic acid