An artificial nucleic acid molecule comprising: a. at least one 5'-untranslated region element (5'UTR element) which comprises or consists of a nucleic acid sequence, which consists of a continuous stretch of nucleotides corresponding to a continuous stretch of nucleotides in the full-length 5'UTR of a TOP gene, which represents at least 80% of the full-length 5'UTR of a TOP gene, or a nucleic acid sequence, which consists of a continuous stretch of nucleotides corresponding to a continuous stretch of nucleotides in a variant of the 5'UTR of a TOP gene, which represents at least 80% of the variant of the 5'UTR of a TOP gene, wherein the variant of the 5'UTR of a TOP gene is at least 80% identical to the naturally occuring 5'UTR, from which the variant is derived, wherein the at least one 5'UTR element does not comprise a functional 5'TOP motif; b. at least one open reading frame; and c. at least one 3'UTR element, which comprises or consists of a nucleic acid sequence which consists of a continuous stretch of nucleotides corresponding to a continuous stretch of nucleotides in the full-length 3'UTR of an albumin gene, which represents at least 80% of the full-length 3'UTR of an albumin gene, or a nucleic acid sequence which consists of a continuous stretch of nucleotides corresponding to a continuous stretch of nucleotides in a variant of a 3'UTR of an albumin gene, which represents at least 80% of the variant of the 3'UTR of an albumin gene, wherein the variant of the 3'UTR of an albumin gene is at least 80% identical to the naturally occuring 3'UTR the variant is derived from. a. at least one 5'-untranslated region element (5'UTR element) which comprises or consists of a nucleic acid sequence, which consists of a continuous stretch of nucleotides corresponding to a continuous stretch of nucleotides in the full-length 5'UTR of a TOP gene, which represents at least 80% of the full-length 5'UTR of a TOP gene, or a nucleic acid sequence, which consists of a continuous stretch of nucleotides corresponding to a continuous stretch of nucleotides in a variant of the 5'UTR of a TOP gene, which represents at least 80% of the variant of the 5'UTR of a TOP gene, wherein the variant of the 5'UTR of a TOP gene is at least 80% identical to the naturally occuring 5'UTR, from which the variant is derived, wherein the at least one 5'UTR element does not comprise a functional 5'TOP motif; a nucleic acid sequence, which consists of a continuous stretch of nucleotides corresponding to a continuous stretch of nucleotides in the full-length 5'UTR of a TOP gene, which represents at least 80% of the full-length 5'UTR of a TOP gene, or a nucleic acid sequence, which consists of a continuous stretch of nucleotides corresponding to a continuous stretch of nucleotides in a variant of the 5'UTR of a TOP gene, which represents at least 80% of the variant of the 5'UTR of a TOP gene, wherein the variant of the 5'UTR of a TOP gene is at least 80% identical to the naturally occuring 5'UTR, from which the variant is derived, b. at least one open reading frame; and c. at least one 3'UTR element, which comprises or consists of a nucleic acid sequence which consists of a continuous stretch of nucleotides corresponding to a continuous stretch of nucleotides in the full-length 3'UTR of an albumin gene, which represents at least 80% of the full-length 3'UTR of an albumin gene, or a nucleic acid sequence which consists of a continuous stretch of nucleotides corresponding to a continuous stretch of nucleotides in a variant of a 3'UTR of an albumin gene, which represents at least 80% of the variant of the 3'UTR of an albumin gene, wherein the variant of the 3'UTR of an albumin gene is at least 80% identical to the naturally occuring 3'UTR the variant is derived from. a nucleic acid sequence which consists of a continuous stretch of nucleotides corresponding to a continuous stretch of nucleotides in the full-length 3'UTR of an albumin gene, which represents at least 80% of the full-length 3'UTR of an albumin gene, or a nucleic acid sequence which consists of a continuous stretch of nucleotides corresponding to a continuous stretch of nucleotides in a variant of a 3'UTR of an albumin gene, which represents at least 80% of the variant of the 3'UTR of an albumin gene, wherein the variant of the 3'UTR of an albumin gene is at least 80% identical to the naturally occuring 3'UTR the variant is derived from.