Patent ID: 8642008

Claim:
A molecular probe comprising any one of the following polypeptides: a polypeptide represented by any one of the following formulae (1) to (4) and (9) to (12) and a polypeptide obtained by deletion, insertion, or substitution of one or two amino acids with respect to a polypeptide represented by any one of the following formulae (1) to (12), (SEQ ID NO. 1) Z-DLSXQMEEEAVRLFIEWLKNGGPSSGAPPPS-NH 2 (1) (SEQ ID NO. 2) Z-LSXQMEEEAVRLFIEWLKNGGPSSGAPPPS-NH 2 (2) (SEQ ID NO. 3) Z-SXQMEEEAVRLFIEWLKNGGPSSGAPPPS-NH 2 (3) (SEQ ID NO. 4) Z-XQMEEEAVRLFIEWLKNGGPSSGAPPPS-NH 2 (4) (SEQ ID NO. 9) B-DLSKQMEEEAVRLFIEWLKNGGPSSGAPPPS-NH 2 (9) (SEQ ID NO. 10) B-LSKQMEEEAVRLFIEWLKNGGPSSGAPPPS-NH 2 (10) (SEQ ID NO. 11) B-SKQMEEEAVRLFIEWLKNGGPSSGAPPPS-NH 2 (11) (SEQ ID NO. 12) B-KQMEEEAVRLFIEWLKNGGPSSGAPPPS-NH 2 (12) where in the foregoing formulae (1) to (4), Z- indicates that an α-amino group at an N-terminus is either not modified, or is modified with a modifying group having no electric charge, X represents a lysine residue, an amino group of a side chain of the lysine residue being labeled with a group represented by the formula (II) below having an aromatic ring, the polypeptide obtained by deletion, insertion, or substitution of one or two amino acids with respect to a polypeptide represented by any one of the formulae (1) to (4) comprises X, in the formulae (9) to (12), B- indicates that an α-amino group at an N-terminus is labeled with a group represented by the formula (II) below having an aromatic ring, and the polypeptide obtained by deletion, insertion, or substitution of one or two amino acids with respect to a polypeptide represented by any one of the formulae (9) to (12) comprises B, and in the foregoing formulae (1) to (4) and (9) to (12), —NH 2 indicates that a carboxyl group at a C-terminus is amidated, wherein R 1 represents a substituent that contains anyone of 123 I, 124 I, 125 I, and 131 I.