 Not only do these parasites develop postphlebotomus digestion, but it is also thought to be essential to oxidative bursts, thus allowing passage for infection.Characteristics of intracellular digestion include an endosome fusing with a lysosome, releasing acid hydrolases which degrade DNA, RNA, proteins and carbohydrates.The genomes of four "Leishmania" species ("L. major", "L. infantum", "L. donovani" and "L. braziliensis") have been sequenced, revealing more than 8300 protein-coding and 900 RNA genes.