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Incorporation of doubly labelled tyrosine into stizolobinic acid and stizolobic acid by the etiolated seedlings of Stizolobium hassjoo was studied. The retention of tritium activity in stizolobinic acid was 55%, while that in stizolobic acid was only 4.4% in average. The results strongly suggest that the heterocyclic rings of these two amino acids may be derived from 3,4-dihydroxyphenyl-alanine (DOPA) by extradiol cleavage of the aromatic ring.

Further Studies on the Biosynthesis of Stizolobinic Acid and Stizolobic Acid in the Etiolated Seedlings of Stizolobium hassjoo