The aim of the collaborative research Centre ChemBioSys is to explore fundamental regulatory processes in complex Biosystems. For advances in medicine, biotechnology and ecology the CRC aim to investigate novel chemical mediators and targets that are involved in structuring complex communities. Representative Biosystems involving fungi, bacteria, microalgae, plants, animals or even human cells will be studied in increasing levels of complexity. The technical advances in multimodal photonics create novel opportunities for scientist to explore multifaceted Biosystems.