1. Department of Chemistry and Applied BiosciencesInstitute of Chemical and BioengineeringETH ZurichZurich8093Switzerland
2. Faculty of Biochemistry, Biophysics and BiotechnologyDepartment of Cell BiochemistryJagiellonian UniversityKrakow31‐007Poland
3. Biotech Process SciencesMerck BiopharmaCorsier‐sur‐Vevey1804Switzerland