Prof. Guse project A01 of SFB1328 (Dept. of Biochemistry and Molecular Cell Biology, University Medical Center Hamburg-Eppendorf) spent two hours at the Johannes-Brahms-Gymnasium, co-teaching with chemistry teacher Mrs Sohr. Subject of the lessons was chronic inflammatory diseases, and the relevance of the mass action law and carboanhydrase function in osteoclast function during rheumatoid arthritis.