“…As shown in Table 7 , the ranks of the top-five amino acids to be TPPs (propensity, difference) for Glu, Lys, Val, Arg and Ile are (1, 1), (2, 2), (3, 3), (4, 4) and (5, 5), respectively, while the ranks of the top-five amino acids to be non-TPPs for Gln, Thr, Ala, Asn and Phe are (20, 20), (19, 18), (18, 19), (17, 16) and (16, 13), respectively. Many previous studies indicated that Glu, Lys and Arg had higher occurrence in TPPs than MPPs 20 , 27 , 28 , 35 , 52 – 55 . For example, Haney et al 53 conducted a comprehensive analysis on 115 protein sequences from M. jannaschii.…”