Christina Woo working in her lab (IMAGE) Harvard University Caption Woo and her lab have designed a pencil/eraser pair to both write and erase an important sugar from proteins, a crucial step to understand how these sugars influence proteins and their connection to diseases like Alzheimer's and Parkinson's. Credit Kris Snibbe/Harvard University Usage Restrictions With attribution. License Licensed content 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.