by Elio — It is not un­ex­pected that the con­tem­pla­tion of bac­te­ria and ar­chaea should fo­cus so much on the na­ture and im­por­tance of their cell en­velopes. Here, af­ter all, is the in­ter­face be­tween the cell's in­te­rior and the out­side world. It is also what a host per­ceives early on when be­com­ing in­fected. Plus, as was...