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.

lovely