. "Genetically modified source" . "PTO-A2MBL21" . "cattle" . "Bos" . "Escherichia" . . "PANCREAS" . "Bos taurus" . . "Escherichia coli" . "BL21 (DE3) PLYSS" . "MATURE PLA2" . "MATURE PLA2" . "BL21" . .