PROBLEM TO BE SOLVED: To provide binding molecules comprising a half-life extending domain which shows an extended serum half-life compared to binding molecules not comprising a half-life extending domain.SOLUTION: A binding molecule comprises at least three binding domains included in at least one polypeptide chain, where (a) the first domain is a binding domain which is capable of binding to a cell surface molecule on a target cell, (b) the second domain is a binding domain which is capable of binding to the T cell CD3 receptor complex, and (c) the third domain is a binding domain which is capable of binding to serum albumin, where the third domain is positioned at the C-terminus of the second domain.SELECTED DRAWING: None
LONG LIFE POLYPEPTIDE BINDING MOLECULES