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1: The Rhizobium nodulation gene nodO encodes a Ca2(+)-binding protein that is exported without N-terminal cleavage and is homologous to haemolysin and related proteins. Economou A, Hamilton WD, Johnston AW, Downie JA; EMBO J 1990;9:349-354. PMID:2303029

2: Three-dimensional structure of the alkaline protease of Pseudomonas aeruginosa: a two-domain protein with a calcium binding parallel beta roll motif. Baumann U, Wu S, Flaherty KM, McKay DB; EMBO J 1993;12:3357-3364. PMID:8253063

3: The subtilin gene of Bacillus subtilis ATCC 6633 is encoded in an operon that contains a homolog of the hemolysin B transport protein. Chung YJ, Steen MT, Hansen JN; J Bacteriol 1992;174:1417-1422. PMID:1735728