The structure of the D49 phospholipase 'A IND.2' piratoxin III from Bothrops pirajai reveals unprecedented structural displacement of the calcuim-binding loop: possible relationship to cooperative substrate binding - Rigden, Daniel J.; Lee, Wen-Hwa; Marangoni, Sérgio; Toyama, Marcos H.; Polikarpov, Igor (Acta Crystallographica D, 2003)