FURIN and COVID-19: Although both SARS‐CoV‐2 and MERS‐CoV are likely to be cleaved by FURIN during S protein priming, we speculate that the MERS‐CoV receptor DPP4 does not have any or high relevance for COVID‐19 as DPP4 is solely expressed in lung cells but not in the subsegmental bronchial branches (Appendix Fig S4).