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Nucleotides with different font size - (Aug/09/2010 )

Hi all

In some papers, I see nucleotides " probes, oligos" beside each other with different size
In fact I would appreciate any help to explain what does that mean?
As you can see from the below picture:

Thanks a lot


Height of the nucleotide reflects its frequency at the corresponding position. Consensus sequences are often dislayed that way. Only one nculeotide at a certain position means 100% conservation.


Thanks so much
It is so clear now to me.