... PR, Saccamo NA,Thadeio PF & Volkmann RA (1996) Posttranslational amino acid epimerization: enzyme-catalyzed isomeriza-tion of amino acid residues in peptide chain. Proc NatlAcad Sci USA 93, ... Morishita F, Nakanishi Y, Kaku S, Furukawa Y, OhtaS, Hirata T, Ohtani M, Fujisawa Y, Muneoka Y &Matsushima O (1997) A novel D -amino- acid- containingpeptide isolated from Aplysia heart. Biochem ... T,Watanabe K, Funase K, Sun XP, Yongsiri A, KimKH, Novales-Li P et al. (1989) Achatin-I, an endo-genous neuroexcitatory tetrapeptide from Achatinafulica Fe´russac containing a D -amino acid...