Provided is a physiologically active peptide which comprises a partial amino acid sequence of enolase originated from and which has a molecular structure that meets the standards set for the production of GMP. A peptide having such a structure that two peptide molecules each comprising (i) an amino acid sequence A01 Ala Ser Glu Phe Tyr Asn Ser Glu Asn Lys Thr Tyr Asp Leu Asp Phe Lys Thr Pro Asn Asn Asp A02 (SEQ ID NO: 1) or (ii) an amino acid sequence A03 Ala Ser Glu Phe Tyr Asn Ser Glu Asn Lys Thr Tyr Asp Leu Asp Phe Lys Thr Pro Asn Asn Asp Lys Ser Leu Val Lys Thr A04 (SEQ ID NO: 2) are lined to a liker peptide represented by (iii) Lys A05 Cys A06 in such a manner that the two peptide molecules can be arranged in a biantennary form through amide bonds between carboxyl terminal of the two peptide molecules and two amino groups in a Lys residue in the linker peptide. Preferably the peptide has a dimerized structure in which the peptides are dimerized through an S S bond formed between a Cys residue in the sequence for the linker peptide in one of the peptides and a Cys residue in the sequence for the linker peptide in the other of the peptides. (In the amino acid sequences (i) (ii) and (iii) each of A01 to A06 represents a molecule composed of an arbitrary number including 0 of amino acid residues.)
