Level 1:
CarbonCatalyticEnergyFabricationMaterial compositionMorphologyNano biologyNano detectionNano deviceNano unitSemiconductorSynthesisTheory
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Level 2:
ALLBiotechnologyCellDiagnosisDiseasesDrug deliveryGenes Therapy TissueTumors
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Level 3:
ALLTissueTissue engineeringTissue regeneration
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