The present invention relates to a platamer having an inhibitory activity against FGF2; A complex comprising an excimer and a functional substance (for example, an affinity substance, a labeling substance, an enzyme, a drug delivery medium, or a drug) having binding activity or inhibitory activity against FGF2; A platemer having a binding activity or inhibitory activity against FGF2, or a medicament, a diagnostic drug, and a labeling agent comprising the complex comprising the plaster and the functional material.
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