Positive Samples: Mouse liver, Mouse heart, Rat liver Immunogen sequence: YFGEISIGTP PQNFLVLFDT GSSNLWVPSV YCQSQACTSH SRFNPSESST YSTNGQTFSL QYGSGSLTGF FGYDTLTVQS IQVPNQEFGL SENEPGTNFV. Pepsin is one of the main proteolytic enzymes secreted by the gastric