The present invention relates to modified nucleotide sequences encoding serum albumin, wherein the mRNA sequence has been codon optimized for expression in a filamentous host cell. Furthermore the present invention relates to serum albumin produced in filamentous fungi or loaded by contacting serum albumin with an extract of a filamentous fungi culture. In an-other aspect the present invention relates to the use of said serum albumin in serum free cell culture media and also to a method of drying and agglomerating serum albumin thereby im-proving wettability and dispersability.
