BRET-based biosensor DNA DNA aptamer DNA-protein conjugate NLS PNA PUF RNA binding protein RNA nanostructure RNA nanotechnology RNA regulation RNA-peptide conjugate RNA-protein complex Schiff base abasic site anticancer drug aptamer artificial viral capsid bic Book Industry Communication::T Technology, engineering, agriculture::TB Technology: general issues camptothecin derivative catalytic RNA cellular uptake conjugate crosslink cytosine methyltransferase cytotoxicity drug delivery drug delivery system encapsulation fluorescent probe