bispecific single-chain antibody specific PSMAxCD3 between species

Molecule bispecific single chain antibody comprising a first binding domain that specifically binds to an epitope chain CD3e (epsilon) of human and Callithrix jacchus, Saguinus oedipus or Saimiri sciureus, wherein said epitope is part of an amino acid sequence comprised in the group consisting of SEQ ID NO. 2, 4, 6 or 8, and comprising at least the amino acid sequence Gln-Asp-Gly-Asn-Glu, and a second binding domain that binds the antigen of prostate-specific membrane (PSMA).