Human codon bias

[PJOB]

Hi,
	I'm looking for a reference or online source that can tell me the codons
preferred in human genes.  I'm trying to make a degenerate oligos for PCR
of a member of a protein family, and there are too many permutations in my
current scheme.  Would it be a valid strategy to reduce this number by
leaning towards preferred codons?  Thanks in advance...

Peter

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Opinions seen here are channeled to me by a Ring-Tailed Lemur named Oxnyx