seedlings of modified plants (IMAGE) Penn State Caption Researchers from Penn State have identified a protein that modifies the cellular machinery responsible for producing cellulose — an integral component of plant cell walls that is an important source of food, textiles, and biofuels. Versions of the plants that prevent this protein from functioning grew similarly as seedlings — pictured here — but had stunted growth as adults. Credit Gu Lab / Penn State. Usage Restrictions Credit must be given to the creator. License CC BY 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.