Abstract: An scFv-Fc dimer binds and neutralizes TGF?1 selectively and with high affinity and avidity. The scFv region may comprise the same VH and VL domains or CDR regions as metelimumab. The unique combination of their smaller size, high selectivity, potency against TGF?1, and long in vivo half-life makes the scFv-Fc dimers ideal candidates for therapeutic applications.