The kozak sequence is GCCRCCATGG With the +4 G and the -3 R (either an A or a G) being the most important nucleotides.
I can't control the first nucleotide of my protein after the start codon but I can control the sequence before the start codon. Can I just use the short sequence of ACC before the start codon, so ACCATG to inititate protein translation in mammalian cells such as human?