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A) Detection of adenosine using aptamer crosslinked hydrogels by sol-gel transition. (adapted from Ref. [73]) B) Signal amplified detection of targets based on colorimetric reaction catalyzed by enzymes released from target-responsive hydrogels (adapted from Ref. [77]). C) Detection of mersury ion using thymine-rich DNA-grafting polymer hydrogels. (adapted from Ref. [78])
