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Is it be possible to synthesize an RNA oligo of 60-120 nucleotides long or longer? In addition, is it be possible to label some inner selected nucleotides as we desire

Yes, we can chemical synthesize a 60-120 mer RNA oligonucleotide and sometime even longer depending on sequence composition. We have successfully made up to a 116 mer modified RNA oligonucleotide and continue to try longer sequences as our customer’s request them. Yes, internal modifications can be incorporated. We can also generate your long RNA oligo by RNA transcript. Visit our website at  Long RNA by Transcription