analysis of the dna sequences of the 5 ' end of the clones demonstrated that although beta- and gamma-actin genes start with a methionine codon ( met-asp-asp-asp and met-glu-glu-glu , respectively ) , the alpha-actin gene starts with a methionine codon followed by a cysteine codon ( met-cys-asp-glu-asp-glu ) .
C0242610
starts
C0009221
codon