EFNA1, Recombinant, Human, aa19-182, His-Tag (Ephrin A1, Ephrin-A1, EFNA1, B61, ECKLG, EFL1, EPH-related Receptor Tyrosine Kinase Ligand 1, EPLG1, Immediate Early Response Protein B61, Ligand of Eph Related Kinase 1, LERK 1, LERK1, LERK-1, Tumor Necrosis Factor alpha Induced Protein 4, TNFAIP4)