Briza, P, M Eckerstorfer, and M Breitenbach. "The sporulation-specific enzymes encoded by the DIT1 and DIT2 genes catalyze a two-step reaction leading to a soluble LL-dityrosine-containing precursor of the yeast spore wall." Proceedings of the National Academy of Sciences 91.10 (1994): 4524-4528. Web. 25 Sept2020.