17139
While most development has focused on cell - permeable probes that selectively bind to G - quadruplex structures with high affinity , these same probes can induce G - quadruplex folding , thereby making the native conformation of the DNA or RNA molecule ( i . e . , in the absence of probe ) uncertain .
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Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
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