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[Concept of molecular imaging].

Molecular imaging research is "to advance our understanding of biology and medicine through noninvasive in vivo investigation of cellular molecular events involved in normal and pathologic processes". This is considered to be useful for holistic understanding of life, a missing viewpoint in recent life sciences. Principle of molecular imaging is a combination of well-designed molecular probe and external detection system. Research on new combination will bring us new insights of life, as well as powerful tools for the development of new drug/therapeutic approach.