Because list of probes on the BeadChip contains some of MIR genes (i.e. MIR1-2, MIR1200, MIR1202, MIR1203 etc.) however, as I remember correctly - the mature microRNAs don't contain the polyA tails, so the oligodT primers don't catch them.

Are these probes related to the pre-microRNA transcripts and do they always have polyA tail?

Thank you for any answers and suggestions!

Best regards,

Agata

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