Hi, 

I have a string "GGGGGGCCCAATCGCAATTCCAATT"

What I want to do is to count the percentage of each letter in the string,
what string functions can I use to count the number of each letter appearing
in the string?

For example, the letter "A" appeared 6 times, letter "T" appeared 5 times,
how can I use a string function to get the these number?

thanks,

karena

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