| 摘要 |
A kit for detecting a target substance in a specimen or measuring the concentration of the target substance comprises an element comprising a magnetic field-detecting site, a first peptide molecule capable of bonding specifically to the target substance and a site for immobilizing the first peptide molecule, a marker material comprising a particle containing a magnetic material and a second peptide molecule capable of bonding specifically to the target substance which second peptide molecule is immobilized on the particle, the first and second peptide molecules being bonded specifically at different regions of the target substance, and at least one of the first and second peptide molecules having a molecular weight lower than an immunoglobulin G molecule.
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