Optogenetically Activated Intracellular Antibody (Optobody) (IMAGE) Institute for Basic Science Caption As GFP photoreceptors (nMagHigh1 and pMagHigh1) are triggered by blue light, split GFP nanoboy fragments, which were roaming freely in the cell, reassemble. These now whole activated GFP nanobodies move toward their target proteins. Credit IBS Usage Restrictions Please indicate the credit. 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.