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protag-HiRes anti-RFP camelid single-domain antibody (sdAb) produced by NanoTag Biotechnologies GmbH. It recognizes RFP and its most common derivatives with high affinity and specificity. It recognizes mOrange2, dsRed1, dsRed2, tdTomato, mRFP, mCherry, mScarlet-i.In protag-HiRes anti-RFP-X1, each fluorophore is coupled to exactly one single-domain antibody, which in turn binds to its target molecule in a monovalent fashion. The high binding affinity and a high coupling efficiency of > 95% guarantees a highly linear relation between target molecule number and fluorescent intensity. This enables you to directly count your target molecule of interest. The fluorophore is located exceptionally close to the recognized epitope (< 1.5 nm), which is ideal for all microscopy techniques.