Cyanobacteria, Wild-type and Modified (image) University of Texas at Austin Caption Left: Two rod-shaped, wild type cyanobacteria. Note the conspicuous absence of any cellulose or sugars on the surface of these cells. Right: A genetically altered cyanobacterium that produced highly visible cellulose (marked by cellulase coupled with an electron dense gold marker). Credit Brown and Nobles, the University of Texas at Austin Usage Restrictions None Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.