COVER Bakers' yeast forms a large floral structure called a mat (~7.5 centimeters in diameter), which is made up of millions of yeast cells. The cells form these multicellular structures with a reproducible pattern when grown on the surface of semi-solid media. A cell surface glycoprotein, Flo11p, is required for mat formation and adherence to plastic. See page 878 [Photograph: F. Frankel]

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