Human TAC1 also known as Tachykinin Precursor 1, Preprotachykinin Neuropeptide Gamma, Substance K, and Neurokinin 1, GenBank Accession No. NM_012452, a.a. 23-166, fused at the C-terminus to the Fc portion of human IgG1 followed by a C-terminal Avi-tag™, expressed in a HEK293 cell expression system. MW=45 kDa.