A cDNA sequence coding for Japanese quail ovalbumin was used for the construction of expression plasmid under the ADH1 promoter of the yeast shuttle vector pVT101-U. The resulting recombinant expression vector pJK2 was used for the transformation of Saccharomyces cerevisiae. Expression of quail ovalbumin in yeast cells was demonstrated by Western blotting followed by immunochemical detection.