The Kozak consensus sequence is a nucleic acid motif that functions as the protein translation initiation site in most eukaryotic mRNA transcripts.

M Kozak, “Point mutations define a sequence flanking the AUG initiator codon that modulates translation by eukaryotic ribosomes,” Cell 44, no. 2 (January 31, 1986): 283-92, http://www.ncbi.nlm.nih.gov/pubmed/3943125. “I have identified ACC-ATG-G as the optimal sequence for initiation by eukaryotic ribosomes”

R. Hamilton, C K Watanabe, and H A de Boer, “Compilation and comparison of the sequence context around the AUG startcodons in Saccharomyces cerevisiae mRNAs.,” Nucleic Acids Research 15, no. 8 (April 24, 1987): 3581–3593. =AAA-ATG-TCT

atataaaaca ATG TCT TTA T...  ScPGK1
           str SER