Alveolar echinococcosis (AE) caused by Echinococcus multilocularis is a severe zoonotic disease in humans. One of the major metacestode antigens of E. multilocularis is the Em2 or Em2(G11) native purified antigen. The main objective of the current study was to identify and characterize the elusive protein backbone of the specific and immuno-dominant Em2(G11) antigen of E. multilocularis. Two biological replicates were used. Following samples are submitted: European isolate (J2012) - Replicate 1 (Sample F284313): 20200127_08_J2012_1F.raw European isolate (J2012) - Replicate 2 (Sample F284314): 20200127_09_J2012_2F.raw Central Asian isolate (AT17) - Replicate 1 (Sample F284307): 20200127_10_AT17_1F.raw Central Asian isolate (AT17) - Replicate 2 (Sample F284308): 20200127_11_AT17_2F.raw