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GC content


# get the fraction of GC content of a DNA sequence in percent
>>>> from Bio.SeqUtils import GC
>>>> GC("TGCAA")
40.0

http://biopython.org/DIST/docs/api/Bio.SeqUtils-pysrc.html#GC


# without Biopython
http://saml.rilspace.org/calculating-gc-content-in-python-and-d-how-to-get-10x-speedup-in-d