We focused on a biological process shared between the 2 tissues: the unfolded protein response (UPR). Both tissues become highly secretory but make different cargoes. Cells activated the UPR prior to cargo production, suggesting developmental anticipation of future stress. (5/)

Viruses are therefore important: they affect all life on earth. They themselves also change, as we now notice with #SARSCoV2 who has made the leap to humans. Viruses can sometimes even determine what will survive. Don't underestimate these little bundles of information.