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As a noninvasive deep-tissue imaging technique, photoacoustic (PA) imaging has great application potential in biomedicine and molecular diagnosis. The zinc ion (Zn2+), which is a necessary metal ion in the human body, plays a very important role in the regulation of gene transcription and metalloenzyme function. The imbalance of Zn2+ homeostasis is also associated with a variety of neurological diseases. Therefore, it is critically important to accurately image the steady-state changes of Zn2+ in vivo. However, no PA imaging method is c