IMPROVED CODING SEQUENCE FOR HUMAN G-CSF

The present invention relates in general to a nucleic acid encoding human granulocyte-colony stimulating factor (G-CSF), wherein the first leucine residue occurring on the N-terminal end of the encoded G-CSF is encoded by a codon other than the CTG/CUG codon, and wherein the nucleic acid does neither comprise the nucleic acid sequence according to SEQ ID NO: 1, nor according to SEQ ID NO: 2, nor according to SEQ ID NO: 3, nor according to SEQ ID NO: 4. The present invention also relates to a nucleic acid 100% complementary to the aforementioned nucleic acid, as well as to vectors and host cells comprising the aforementioned nucleic acids. Finally, the present invention relates to methods for producing human G-CSF using these nucleic acids, vectors and/or host cells and resulting G-CSF compositions.