To investigate the role of TcRpL7a repeats during the immune response elicited after infection by T. cruzi, we produced three recombinant version of the TcRpL7a protein: one containing only the 90 amino acid N-terminal region corresponding to the repeat domain (TcRpL7aRep, 10 kDa), the second containing a 223 amino acid C-terminal region, corresponding to the non-repetitive domain (TcRpL7aΔRep, 30 kDa), and a third version containing the complete, 319 amino acid, T. cruzi L7a antigen (TcRpL7a, 45 kDa). The gene discussed is RPL7A; the disease is infection.